ساعت ۲۴ امشب ثبت نام ها به پایان خواهد رسید

Channel
دکتر کیوانی
@dr_keivani
On this record: Topic · Growth · Engagement · What this channel posts · Posts · Posts edited after publishing · Polls · Citations · Telegram's recommendations · Cite this entry
22,168subscribers
+593 since we began measuring on 6 August 2026
Risers and fallers across the register · movement among entries of 10,000–31,623.
Register entry
| Telegram ID | -1001640937626 |
|---|---|
| Type | Channel |
| Username | @dr_keivani |
| Description | آموزش پزشکی| آزمون | مشاوره | Ascend ارتباط با منشی: @drkeivanigroup سایت: http://news.drkeivanigroup.ir |
| Created | Between 1 December 2021 and 30 April 2023 — estimated from Telegram’s id allocation, not measured. How this range is calculated. |
| First recorded | 6 August 2026 |
| Last confirmed live | 4 October 2026 |
| Measurements held | 36 |
| Confirmed unchanged | 1 time, most recently 4 October 2026 |
| On Telegram | t.me/dr_keivani |
Topic
Education — a classification, not a measurement. An on-box language model (Qwen3.6-35B-A3B-FP8, prompt version 1) read this channel’s own recent posts on 10 September 2026 and assigned it the closest of 31 fixed categories, at 99% confidence. This is a model’s judgement about what the channel is likely to be about, not a fact this register measured the way a subscriber count or a view count is measured — it can be revised on a later pass, and it carries no weight anywhere else on this page. How this classification works, and why it has no browse page of its own yet.
Growth
| Measured (UTC) | Subscribers | Change |
|---|---|---|
| 4 Oct 2026, 11:36 | 22,168 | +121 |
| 26 Sept 2026, 02:38 | 22,047 | +506 |
| 19 Sept 2026, 06:01 | 21,541 | -192 |
| 16 Sept 2026, 16:40 | 21,733 | +382 |
| 14 Sept 2026, 22:40 | 21,351 | -173 |
| 13 Sept 2026, 11:18 | 21,524 | -165 |
| 11 Sept 2026, 14:36 | 21,689 | +313 |
| 8 Sept 2026, 20:40 | 21,376 | -148 |
| 5 Sept 2026, 16:00 | 21,524 | -92 |
| 3 Sept 2026, 13:57 | 21,616 | -18 |
| 2 Sept 2026, 09:12 | 21,634 | +43 |
| 1 Sept 2026, 08:56 | 21,591 | -48 |
| 31 Aug 2026, 06:48 | 21,639 | -29 |
| 30 Aug 2026, 03:25 | 21,668 | +252 |
| 29 Aug 2026, 00:35 | 21,416 | -89 |
| 27 Aug 2026, 23:03 | 21,505 | -11 |
| 26 Aug 2026, 20:37 | 21,516 | -53 |
| 25 Aug 2026, 18:24 | 21,569 | -59 |
| 24 Aug 2026, 20:02 | 21,628 | -106 |
| 23 Aug 2026, 02:45 | 21,734 | first reading |
Engagement
202 posts held, back to 1 August 2026 — the reader has not yet reached the start of this channel’s public history, so older posts may sit further back, unread. Read across 70 pages of Telegram’s post history, 20 posts per page.
- ERR · 30 days
- 41.8%
- avg views ÷ 22,168 subscribers
- Avg views / post
- 9,270
- 33 posts measured
- Reaction rate
- —
- this channel exposes no reaction counts
- Posts in window
- 33
- of 202 held
ERR is average views per post over the last 30 days divided by subscribers, the definition TGStat uses, so this figure is comparable with the one you will see elsewhere. It falls structurally as a channel grows: a high ERR on a small channel and a low one on a large channel describe reach mathematics, not quality. We publish the figure and the sample it came from and pass no verdict on it.
ER is defined industry-wide as (forwards + reactions + comments) ÷ views — note the denominator is views, not subscribers. Telegram’s public web preview carries views and reactions but not forward or comment counts, so the reaction rate above is the reactions term only and is therefore a floor: the true ER for this channel is higher by an amount we have not measured and will not estimate.
| Window | Rolling 30 days · latest post in window 5 October 2026 |
|---|---|
| Posts held | 202 (1 August 2026 – 5 October 2026) |
| Views total | 305,770 |
| Reactions total | — |
| Forwards / comments | not exposed by the public surface — not measured, not estimated |
| Readings taken | 5 Oct 2026, 14:03 UTC |
Views are a single reading per post, taken at the time above. A post published in the last day or two is still accumulating views, which pulls the 30-day average down slightly. That is a property of the standard definition rather than a fault in it, so we keep the definition rather than “correcting” the number into something nobody can reproduce.
Precision. Telegram publishes view counts on its public widget in short form — 8.12K, 3.7M — so any reading at or above 1,000 reaches us rounded to three significant figures, and only counts below 1,000 are exact. Averages and rates derived from them are shown to the same precision rather than to the unit: a figure like 3,701,250 would assert digits nobody measured.
Reaction counts are published per emoji and rounded the same way, so a total below 1,000 is exact and a larger one is a sum that may carry a rounded component from each emoji above 1,000. Because it is a sum, it does not look rounded — read a large reaction total as three significant figures per contributing emoji rather than as the figure it prints.
What this channel posts
- Photos
- ≈1,870
- Videos
- ≈204
- Links
- ≈243
Lifetime counters from Telegram’s own channel header, read 5 October 2026 — not the date at the top of this page, which is when the subscriber count was last read. A count marked ≈ was rounded by Telegram before we ever saw it — t.me prints these counters in full below 1,000 and to three significant figures above, so ≈142,000 means somewhere between 141,500 and 142,499.
- Video runtime
- 17s
- Average length
- 17s
Measured directly from 1 video with a duration reading, out of the posts we hold for this channel — not this channel’s whole posting history, only the sample this register has actually read. An exact reading to the second, taken from the post itself rather than from Telegram’s own rounded chrome, so it carries no ≈ mark.
Recent posts
همکاران محترم با کمی صبر ادمین به درخواست های شما برای ورود به مجموعه پاسخ خواهد داد. باتوجه به شرایط و پیام های شما کمی این موضوع طول می کشد. ممنون از صبوریتون
📣 ثبتنام مجموعه دکترکیوانی: این مرحله، آخرین ثبتنام دوره ۱۴۰۶ و مرحله دوم ثبتنام دوره ۱۴۰۷ خواهد بود. ظرفیتها و خدمات این مرحله: 1️⃣ مشاوره 🔹 آخرین مرحله ثبتنام مشاوره ۱۴۰۶ ظرفیت: فقط ۲۰ نفر 🔹 مرحله دوم ثبتنام مشاوره دستیاری ۱۴۰۷ ظرفیت: ۵۰ نفر 2️⃣ آزمونهای دکترکیوانی 🔸 ثبتنام آزمونهای ۱۴۰۶ از فاز دوم 🔸 ثبتنام آزمونهای ۱۴۰۷ از فاز اول 3️⃣ لاین مشاوره تخصصی با رتبه ۱ 🏆 مشاوره اختصاصی با دکتر محمدمه…
هفت خان۴ تمام شد….
ظرفیت وبینار با حضور ۱۰۰۰ نفر پر شد و دیگر نمیتوانید وارد روم وبینار شوید. دوستانی که وارد شدند رفرش نکنند
امشب، آخرین شب هفتخان ۴ است. یک ماه کنار هم بودیم. حسنختام هفتخان ۴ را تبدیل کردیم به یک جلسه پرسش و پاسخ؛ با حضور رتبه ۱ آزمون دستیاری ۱۴۰۵، تا هر چیزی که هنوز برایتان مبهم مانده، مستقیم بپرسید و جواب بگیرید. اما قبل از تمام شدن این یک ماه، میخواهم درباره دلیل شکلگیری هفتخان چند جمله بگویم. هفتخان از ابتدا یک برنامه تبلیغاتی یا چند جلسه مناسبتی نبود. خیلی ساده میشد صرفا در یک شب برگزار کرد. دو شب برگزا…
پرسش و پاسخ آزاد با رتبه ۱ دستیاری ⏳شنبه ۱۱ مهر ماه ۱۴۰۵ ساعت ۲۰ تا ۲۳ 💯 با حضور دکتر اناری رتبه ۱ دستیاری ۱۴۰۵ 💯 لینک ثبت نام در این کانال قرار خواهد گرفت👇 @Dr_keivani
امشب ساعت ۸ آخرین جلسهای از هفت خان ۴ که تجربیات ۴ رتبه برتر دستیاری ۱۴۰۵ را از زبان خودشان خواهید شنید
نفرات برتر آزمون سیزدهم پروژه اول دستیاری ۱۴۰۶ ( ۵-۲ مهر ) تعداد شرکتکنندگان: ۷۳۱ نفر
کم کم داریم به انتهای هفت خان نزدیک میشیم امشب ساعت ۸ ۴ رتبه برتر
کمتر از ۴ ساعت دیگر در هفت خان ۴ در گفتگو با ۴ رتبه برتر دستیاری ۱۴۰۵ رتبه های برتری که هر کدام داستان شنیدنی خاص خودشان را دارند امشب ساعت ۸
کارنامه ی نفر اول آزمون سیزدهم از پروژه اول با ۷۳۱ نفر شرکت کننده. این جامعه آماری، بزرگترین جامعه آماری میان آزمونهای آزمایشی کشور به شمار میرود.
Showing the 12 most recent of 202 posts we hold for @dr_keivani. View and reaction counts are the latest single reading for each post, not a live figure, and a recent post is still accumulating both. A view count marked ≈ was rounded by Telegram before we ever saw it — t.me prints views in full below 1,000 and to three significant figures above, so ≈1,200,000 means somewhere between 1,150,000 and 1,249,999. Unmarked counts are exact. Text is reproduced from the public post preview and truncated for length.
Posts edited after publishing
@dr_keivani edited 2 posts after it first published — the same permalink now carries different wording than the one this register originally read, caught because our own crawl held a copy of the earlier text.
An edit is not deception. Typo fixes, price updates and corrections look exactly like this too — this register can tell you the wording changed and when, not why. How this is measured.
- First edit seen
- 21 August 2026
- Most recent edit
- 25 August 2026
Polls
The poll we hold for this entry, as Telegram rendered it when we read the post. A poll’s figures keep moving after that, so each one is dated.
چه مقطعی هستید؟
- علوم پایه5%
- فیزیوپات4%
- استیجر13%
- اینترن22%
- فارغ التحصیل45%
- رزیدنت6%
- سایر5%
Shares as published. No per-option vote count is published by Telegram, so none is shown.
Percentages only — there are no per-option vote counts here, because Telegram publishes none. The public post preview gives each option’s share and a single voter total, and nothing else. Multiplying one by the other would produce a per-option tally that looks measured and is not: the shares are rounded to whole numbers before we ever see them. We print what was published and leave the column that does not exist empty.
The shares need not add up to 100. Rounding alone puts many polls at 99 or 101. A poll that allows more than one answer per voter runs well past 100 by design, and several here do. The bars are drawn against a fixed 100% track at each option’s own percentage rather than normalised to the total, so a poll that exceeds it shows that it does instead of being quietly rescaled.
Read from the 202 most recent posts we hold, published 1 August 2026 to 5 October 2026. Telegram labels each poll by kind — an anonymous poll, a quiz, a closed set of final results — and that label is reproduced rather than paraphrased.
Forward network
Republished by
Channels on the register that have forwarded this channel's posts into their own feed.
@Learningvideos99 · 38,7953 postsصدای دانشجو
@S_Daneshju · 29,0613 postsدانشگاه علوم پزشکی تلگرام
@TelUMS · 15,9723 postsMedical University 🏛⚕
@medicaluniversity · 83,0173 postsmedistU | مدیستیو
@medistU · 53,7583 postsاطلاع رسانی پزشکی مهر 98
@Ajums_Medicine_Mehr98 · 4682 postsاطلاعرسانی آزاد علوم پزشکی
@IAUTM · 26,6612 postsتوییتر دانشجویان علوم پزشکی 👨🏻⚕👩🏻⚕
@MSS_twitter · 18,7602 postsنسخه لند
@NoskheLand · 18,4272 postsرویداد لند/Rooydad Land
@Rooydad_Land · 11,2492 postsطب اورژانس EMERGENCY
@med_info · 33,8512 postsتوییتر دانشجویان علوم پزشکی
@medtweeet · 84,5182 posts👩⚕️ MUI Mehr 96 👨⚕️
@mui_mehr96 · 5492 postsMed 401-1
@pezeshkiarak4011 · 5512 postsنسخه نویسی فارمامدیکال
@pharmamedicall2 · 32,3522 postsUT meds
@utmeds · 14,6802 postsدانشــ🎓ــجو
@Daneshjoo · 354,3841 postدستیاری
@Dastyari52 · 8,8951 postFunical
@Funical · 13,3981 postMed Line | مِد لاین
@Medical_line · 38,4431 postرزیدنت نیوز ן دستیاری - اینترنی
@Medical_resident · 21,4741 postاطلاع رسانی پزشکی بهمن 96
@Medicine_KMUS_96B · 3581 postفـارمِــد ן PharMed
@PharMed_ir · 13,1801 postکانال طِب اَطفال
@TebeAtfal · 51,8561 post📞 الو بیمارستان؟
@alo_bimarestan · 29,3171 postکانال پزشکی آوان
@avaan_med · 10,5541 postمتخصصین بهداشت ایران
@behdashtian · 50,3621 postLYMPHOPOD
@lymphopod · 9,0431 postMed BUMS 002 Info
@med1400_2 · 4021 postMUI 96(bahman)
@med_stu_mui96 · 6881 postاطلاع رسانی پزشکی بهمن ۱۴۰۰
@medbahman400 · 8851 postMedical Jozveh
@medical_jozveh_channel · 125,2501 postMedical_University
@medical_university · 15,6851 postMedical journal club
@medicaljuornal · 2881 postMediVent ® | مِد ایونت🏛 ⚕
@medivent · 11,0151 postمِدپلاس | Medjuu
@medjuu · 8,5251 postدانشگاه علوم پزشکی اصفهان
@mui_ac · 12,2941 postدکتر نازنین جلال کمالی
@nazaninjalalkamali · 1,3921 postاطلاع رسانی پزشکی بهمن ۹۹
@nim2medicine · 6651 postاطلاعرسانی پزشکی مهر ۹۶ (دوره ۶۷)
@pezeshki_mehr96 · 5661 postپُست کشیک
@postkeshik · 39,3851 postSums MD B99 News Plus
@sumsb99plus · 1701 post
Built only from forwarded posts we have actually read, on both sides. Coverage is early and deliberately incomplete: a missing link means we have not read the post that would prove it, never that the relationship does not exist. Counts are distinct forwarded posts observed, so they only ever go up as we read more.
Mentions
Named by 49 registered channels — every channel on the register whose own posts have named this one, by its current username or any other username it currently holds, merged from two separately captured readings of the same fact so a namer caught by only one of them is not missed and a namer both caught is not counted twice. A username this channel has since dropped is not matched — that handle may belong to someone else now, and crediting today’s namer to yesterday’s owner would misattribute it. The 24 listed below are the most frequent namers; the rest are counted above but not each listed.
Named by
Channels on the register whose posts name this channel's handle.
@TelUMS · 15,9724 postsمدیکالیسم | medicalism
@Doctor_MIB_iran · 40,4653 postsدانشگاه علوم پزشکی اصفهان
@mui_ac · 12,2943 postsدستیاری
@Dastyari52 · 8,8952 postsتشخیص های افتراقی
@differential_diagnosis1 · 32,3302 postsفیلمومِد
@Learningvideos99 · 38,7952 postsطب اورژانس EMERGENCY
@med_info · 33,8512 postsاطلاع رسانی پزشکی بهمن ۱۴۰۰
@medbahman400 · 8852 postsMedical University 🏛⚕
@medicaluniversity · 83,0172 postsmedistU | مدیستیو
@medistU · 53,7582 postsتوییتر دانشجویان علوم پزشکی
@medtweeet · 84,5182 postsتوییتر دانشجویان علوم پزشکی 👨🏻⚕👩🏻⚕
@MSS_twitter · 18,7602 posts👩⚕️ MUI Mehr 96 👨⚕️
@mui_mehr96 · 5492 postsMed 401-1
@pezeshkiarak4011 · 5512 postsنسخه نویسی فارمامدیکال
@pharmamedicall2 · 32,3522 postsصدای دانشجو
@S_Daneshju · 29,0612 postsSums MD B99 News Plus
@sumsb99plus · 1702 postsاطلاع رسانی پزشکی مهر 98
@Ajums_Medicine_Mehr98 · 4681 post📞 الو بیمارستان؟
@alo_bimarestan · 29,3171 postاطلاعرسانی آزاد علوم پزشکی
@IAUTM · 26,6611 postMUI 96(bahman)
@med_stu_mui96 · 6881 postپُست کشیک
@postkeshik · 39,3851 postSUMS 98B news
@sums_b98 · 8131 postکانال طِب اَطفال
@TebeAtfal · 51,8561 post
A mention is a weaker signal than a forward and is counted separately for that reason — naming a channel is not republishing it, and a handle in a post body is easy to place deliberately. The post counts beside each row below are distinct posts in which the handle appeared, from posts we have read on both sides — the “Named by N registered channels” figure above is a different count, of distinct NAMING CHANNELS rather than posts, and is not the sum of the rows under it.
Channels Telegram recommends alongside this one
Telegram’s own answer, not this register’s. When this register asks Telegram’s API what is similar to this channel, this is the list it returns, in the exact order Telegram returns it — never re-sorted by subscribers or by anything else this register measures. The relationship, and the order, are Telegram’s; we record them and date them, and make no claim of our own about which of these channels actually resemble this one.
@Drsepehrnickzad · 17,480#1
@Residentology · 21,328#2
@drpirhaji · 17,191#3
@postkeshik · 39,385#4
@Dastyari52 · 8,895#5
@medical_jozveh_channel · 125,250#6
@drtahernezhadgroup · 14,115#7
@medicaluniversity · 83,017#8
@mediccenter_residenti · 12,736#9
@medmoshaver · 23,936#10
@Medical_resident · 21,474#11
@ghavaninesenfi · 20,297#12
@Medical_line · 38,443#13
@medicalpoint100 · 19,249#14
@medofast_balini · 35,373#15
@moshaverh_doctor_abedi · 4,757#16
@avayepezeshkan · 7,910#17
@Doctor_MIB_iran · 40,465#18
@medtweeet · 84,518#19
@dr_madinei · 10,133#20
@residentkeshik · 14,229#21
@DrBahariii · 9,161#22
@DoctorsFarm · 12,169#23
@weektalk · 5,727#24
@dastyari724 · 946#25
@Meducation_channel · 6,548#26
@moshaver_bahmani · 77,265#27
@nahaie14031403 · 963#28
@freemedico · 8,544#29
@medical_mehregan · 5,643#30
@micruuuuuub · 3,568#31
@medpodcast · 13,197#32
@Balinoma · 21,876#33
@armingorjian · 6,504#34
@zarooriatpezeshki · 13,261#35
@Dr_Ghasri · 5,636#36
@pre_interni · 16,648#37
@med99exams · 916 (as read 23 September 2026)#38
@medico_way · 16,000#39
@medjuu · 8,525#40
@Pnashrpub · 4,115#41
@drramezani_education · 8,971#42
@FullPathoPublic · 5,421#43
@medofast_oloompaye · 22,249#44
@DoctorExam · 6,829#45
@noavarandanesh · 7,005#46
@kaar_amoozi · 3,027#47
@oloom_payeh · 8,986#48
@drsorosuhfekrinejad · 4,320#49
@dr_zakeri_co · 1,912#50
@Dr_zahabi · 6,192#51
@Prepasss · 7,908#52
@SGC_TUMS · 14,401#53
@insight_mahanmed_drhassanian · 2,315#54
@med_yar · 12,164#55
@dastyari100percent · 10,324#56
@residentgram · 17,109#57
@tajrobedastyari · 1,580#58
@medic_resident · 2,775 (as read 23 September 2026)#59
@Atropine_urology · 4,681#60
@medoftehranuniversity · 5,543#61
@Learningvideos99 · 38,795#62
@medicalshora · 2,859#63
@tabadol_jozveh2 · 9,511#64
@lmedixl · 39,820#65
@medistU · 53,758#66
@medilancer · 96,394#67
@schoolofmedicine_ir · 26,622#68
@AIRDROP_KAZEMI · 2,911#69
@MedicalTermino · 15,894#70
@KAclip · 3,520#71
@svadoudi_psy · 1,023 (as read 23 September 2026)#72
@salahiat_balini_film · 11,634#73
@medicalstudentazadsari · 400 (as read 23 September 2026)#74
@Internal_Medicine_For_Students · 12,150#75
@amoozesh_karvarzi · 783#76
@drjian · 26,556#77
@med_skills · 37,953#78
@S_Daneshju · 29,061#79
@doctor_soroush · 8,366#80
@dr_saharmirzaee · 3,350#81
@jozvealef1401 · 6,953#82
@pezeshkan_sahmiei · 19,949#83
@YouMedChannel · 1,580#84
@cryptoxpluss · 193#85
@jozvetums1402 · 12,679#86
@medical_drugs1 · 51,643#87
@medical_jobb · 7,778#88
Read from Telegram’s recommendation API, most recently 23 September 2026. Telegram holds a list like this for a small and growing share of the register — how this is measured, and why most channel pages show nothing here.
Appears in Telegram’s recommendations for other channels
The reverse of the list above, and a different kind of signal. This does not require this channel to have ever been asked about directly — each row below is a channel we DID ask Telegram about, whose Telegram-generated list happened to include this one. A channel can appear here with an empty list above it, because being named by someone else’s query is independent of having been queried itself.
@medmoshaver · 23,936
Telegram ranks this channel #5 of 90 here — alongside 89 others — read 17 September 2026
@medicalpoint100 · 19,249
Telegram ranks this channel #6 of 89 here — alongside 88 others — read 2 October 2026
@Residentology · 21,328
Telegram ranks this channel #6 of 87 here — alongside 86 others — read 26 September 2026
@Medical_resident · 21,474
Telegram ranks this channel #10 of 91 here — alongside 90 others — read 25 September 2026
@Medical_line · 38,443
Telegram ranks this channel #20 of 90 here — alongside 89 others — read 1 September 2026
@postkeshik · 39,385
Telegram ranks this channel #20 of 95 here — alongside 94 others — read 31 August 2026
@medical_jozveh_channel · 125,250
Telegram ranks this channel #24 of 87 here — alongside 86 others — read 18 August 2026
@ghavaninesenfi · 20,297
Telegram ranks this channel #34 of 95 here — alongside 94 others — read 27 September 2026
@drkahmadi · 18,762
Telegram ranks this channel #37 of 85 here — alongside 84 others — read 5 October 2026
@medofast_balini · 35,373
Telegram ranks this channel #40 of 90 here — alongside 89 others — read 4 September 2026
@lmedixl · 39,820
Telegram ranks this channel #50 of 85 here — alongside 84 others — read 31 August 2026
@Balinoma · 21,876
Telegram ranks this channel #60 of 91 here — alongside 90 others — read 25 September 2026
@karyabip · 23,024
Telegram ranks this channel #60 of 80 here — alongside 79 others — read 19 September 2026
@medicaluniversity · 83,017
Telegram ranks this channel #60 of 89 here — alongside 88 others — read 18 August 2026
@Doctor_MIB_iran · 40,465
Telegram ranks this channel #69 of 89 here — alongside 88 others — read 26 August 2026
@pharmamedicall2 · 32,352
Telegram ranks this channel #70 of 87 here — alongside 86 others — read 5 September 2026
@pezeshkan_sahmiei · 19,949
Telegram ranks this channel #71 of 89 here — alongside 88 others — read 29 September 2026
@drjian · 26,556
Telegram ranks this channel #78 of 90 here — alongside 89 others — read 12 September 2026
@medilancer · 96,394
Telegram ranks this channel #78 of 93 here — alongside 92 others — read 18 August 2026
@medistU · 53,758
Telegram ranks this channel #84 of 96 here — alongside 95 others — read 24 August 2026
@med_skills · 37,953
Telegram ranks this channel #89 of 92 here — alongside 91 others — read 31 August 2026
This channel appears in 21 seed channels' Telegram-generated recommendation lists in total. Each is Telegram’s list for THAT channel, not this one — see how this is measured.
Cite this entry
A live page changes as we take new readings, so a citation should name the measurement it is based on, not just the URL. The line below cites the subscriber count as measured 4 October 2026 — this entry's latest reading, not the date you are reading this.
“دکتر کیوانی” (@dr_keivani), 22,168 subscribers as measured 4 October 2026. Telegram Register, tgregister.com/channel/dr_keivani.
Full measurement history, CC BY 4.0. Every reading this register holds for this entry, not just the latest one, as a dated, downloadable record: CSV · JSON. Free to use with attribution to tgregister.com. Each file carries its own generation timestamp, which is the figure to cite for exactly when the data was retrieved.