TCP SYN (JA4T)

42300_2-4-8-1-3-34-1-1_1410_8

first seen 2026-07-01 08:59 · last seen 2026-10-20 01:37 · JSON

Distinct clients per day (last 30 days, peak 14/day)

Distinct clients are counted by IP-hash per complete UTC day — unlike observation counts this is insensitive to one chatty client, but NAT merges clients and address rotation splits them.

Decomposed attributes

TCP window42300
Option kinds2-4-8-1-3-34-1-1
MSS1410
Window scale8

Co-observed signals

Signals from other families seen in the same observation. A fingerprint spread thinly across many lower-layer signatures is a classic inconsistency signal.

TLS ClientHello (JA4)

fingerprintco-occurrences
t13d3112h1_e8f1e7e78f70_8d633dac7124 Match?Exact match in Thumbprint's published controlled catalog captures: curl 7.88.1.The fingerprint page shows the full measured match list. More on the catalog.155
t13d3112h2_e8f1e7e78f70_8d633dac7124 Match?Exact match in Thumbprint's published controlled catalog captures: curl 7.88.1.The fingerprint page shows the full measured match list. More on the catalog.151

HTTP request (JA4H)

fingerprintco-occurrences
ge20nn040000_b221e026a664_000000000000_000000000000139
ge11nn060000_3e7ded867bc2_000000000000_000000000000101
ge11nr070000_94ff8b959492_000000000000_00000000000034
ge11nn060000_3af985fbeab8_000000000000_00000000000020
ge20nn040000_31537f9be9e0_000000000000_00000000000012

HTTP/2 frames (Akamai)

fingerprintco-occurrences
3:100;4:65536;2:0|1048510465|0|m,s,a,p Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.13.0, curl 8.18.0, curl 8.21.0, +8 more.The fingerprint page shows the full measured match list. More on the catalog.151

TCP SYN (p0f)

fingerprintco-occurrences
4:45+19:0:1410:mss*30,8:mss,sok,ts,nop,ws,?34,nop,nop::081
4:41+23:0:1410:mss*30,8:mss,sok,ts,nop,ws,?34,nop,nop::046
4:40+24:0:1410:mss*30,8:mss,sok,ts,nop,ws,?34,nop,nop::035
4:44+20:0:1410:mss*30,8:mss,sok,ts,nop,ws,?34,nop,nop::025
4:37+27:0:1410:mss*30,8:mss,sok,ts,nop,ws,?34,nop,nop::018
4:39+25:0:1410:mss*30,8:mss,sok,ts,nop,ws,?34,nop,nop::017
4:43+21:0:1410:mss*30,8:mss,sok,ts,nop,ws,?34,nop,nop::015
4:46+18:0:1410:mss*30,8:mss,sok,ts,nop,ws,?34,nop,nop::014
4:47+17:0:1410:mss*30,8:mss,sok,ts,nop,ws,?34,nop,nop:ecn:012
4:42+22:0:1410:mss*30,8:mss,sok,ts,nop,ws,?34,nop,nop:ecn:08

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (compatible; YandexBot/3.0; +http://yandex.com/bots)247
Mozilla/5.0 (compatible; YandexRenderResourcesBot/1.0; +http://yandex.com/bots) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/108.0.0.032
Mozilla/5.0 (compatible; YandexBot/3.0; +http://yandex.com/bots) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/108.0.0.019
Mozilla/5.0 (compatible; YandexFavicons/1.0; +http://yandex.com/bots)5
Mozilla/5.0 (iPhone; CPU iPhone OS 18_7 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/26.2 Mobile/15E148 Safari/604.1 (compatible; YandexRenderResourcesBot/1.0; +http://yandex.com/bots)2
Mozilla/5.0 (iPhone; CPU iPhone OS 18_7 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/26.2 Mobile/15E148 Safari/604.1 (compatible; YandexBot/3.0; +http://yandex.com/bots)1

Country

fingerprintco-occurrences
RU · Russia255
TR · Turkey36
KZ · Kazakhstan15

Network (ASN)

fingerprintco-occurrences
AS13238 · YANDEX LLC255
AS212066 · Buyuk Reklam Cozumleri LLC36
AS207304 · Y. Izdeu men Jarnama LLP15

TLS supported groups

fingerprintco-occurrences
001d,0017,001e,0019,001810