TCP SYN (JA4T)

64240_2-4-8-1-3_1418_9

first seen 2026-06-30 07:09 · last seen 2026-11-01 03:27 · JSON

Last 7 days (63 observations)

Distinct clients per day (last 30 days, peak 16/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 window64240
Option kinds2-4-8-1-3
MSS1418
Window scale9

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
t13d1712h2_5b57614c22b0_ef7df7f74e48304
t13d1713h2_5b57614c22b0_02c8e53ee398210
t13d1712h2_5b57614c22b0_d5fe2c511efa93
t13d4312h1_c7886603b240_b26ce05bbdd62
t13d1812h1_85036bcba153_d41ae481755e2

HTTP request (JA4H)

fingerprintco-occurrences
ge20nn06enus_32386ca2063f_000000000000_000000000000607
ge11nn050000_b223a0ebb0b5_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: python-requests 2.34.2, python-requests 2.33.1, python-requests 2.32.3.The fingerprint page shows the full measured match list. More on the catalog.2
ge11nn040000_e1d2031bdfea_000000000000_0000000000001
ge11nn05enus_16a7191cb35b_000000000000_0000000000001

HTTP/2 frames (Akamai)

fingerprintco-occurrences
2:0;1:4096;8:0;3:1024;4:1048576|25100289|0|a,p,m,s607

TCP SYN (p0f)

fingerprintco-occurrences
4:48+16:0:1418:mss*44,9:mss,sok,ts,nop,ws:df,id+:072
4:49+15:0:1418:mss*44,9:mss,sok,ts,nop,ws:df,id+:067
4:39+25:0:1418:mss*44,9:mss,sok,ts,nop,ws:df,id+:066
4:44+20:0:1418:mss*44,9:mss,sok,ts,nop,ws:df,id+:064
4:38+26:0:1418:mss*44,9:mss,sok,ts,nop,ws:df,id+:063
4:43+21:0:1418:mss*44,9:mss,sok,ts,nop,ws:df,id+:042
4:47+17:0:1418:mss*44,9:mss,sok,ts,nop,ws:df,id+:040
4:40+24:0:1418:mss*44,9:mss,sok,ts,nop,ws:df,id+:038
4:42+22:0:1418:mss*44,9:mss,sok,ts,nop,ws:df,id+:038
4:45+19:0:1418:mss*44,9:mss,sok,ts,nop,ws:df,id+:034

User-Agent

fingerprintco-occurrences
Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko); compatible; ChatGPT-User/1.0; +https://openai.com/bot607
Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko); compatible; AzureAI-SearchBot/1.0;2
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/142.0.0.0 Safari/537.361
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/146.0.0.0 Safari/537.361

Country

fingerprintco-occurrences
US · United States154
JP · Japan50
AU · Australia48
DK · Denmark48
CH · Switzerland41
PL · Poland37
DE · Germany32
BE · Belgium31
NZ · New Zealand30
ES · Spain29

Network (ASN)

fingerprintco-occurrences
AS8075 · Microsoft Corporation609
AS55666 · PT Media Sarana Data2

TLS supported groups

fingerprintco-occurrences
001d,0017,0018,0019 Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.21.13, curl 8.7.1.The fingerprint page shows the full measured match list. More on the catalog.130
001d,0017,001e,0019,0018,0100,0101,0102,0103,0104 Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.13.0, php-guzzle 8.3.1, curl 7.88.1, +10 more.The fingerprint page shows the full measured match list. More on the catalog.2