TCP SYN (JA4T)

64620_2-4-8-1-3_1436_7

first seen 2026-06-30 00:03 · last seen 2026-10-23 22:06 · JSON

Distinct clients per day (last 30 days, peak 1/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 window64620
Option kinds2-4-8-1-3
MSS1436
Window scale7

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
t13d131000_f57a46bbacb6_e7c285222651 Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.23.12.The fingerprint page shows the full measured match list. More on the catalog.25
t13d311200_1d947a95fc68_7e1102d2036b Match?Exact match in Thumbprint's published controlled catalog captures: java-urlconnection 17.0.19.The fingerprint page shows the full measured match list. More on the catalog.13
t13d111300_c5d436628c5c_d2ecb68026172
t13d3013h2_1d37bd780c83_8537cf56674e1
t13d1410h2_a86a350f0c6f_5603904660151
t13d0810h2_47fb3b3825b1_5603904660151

HTTP request (JA4H)

fingerprintco-occurrences
ge11nn030000_cd680697de12_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: powershell 7.6.6, powershell 7.6.5, powershell 7.6.4, +11 more.The fingerprint page shows the full measured match list. More on the catalog.14
ge10nr040000_1b2a64d23beb_000000000000_00000000000012
ge11nr030000_cd680697de12_000000000000_00000000000010
ge20nn04enus_989c7cc05c9b_000000000000_0000000000002
ge10nn040000_1b2a64d23beb_000000000000_0000000000001
ge20nn030000_bf75ddd0bb29_000000000000_0000000000001
ge11nr040000_bfb2fc23090b_000000000000_0000000000001
ge11nn06enus_acd98d69ca0d_000000000000_0000000000001
ge11nn05enus_be28aeae9f5e_000000000000_0000000000001

HTTP/2 frames (Akamai)

fingerprintco-occurrences
1:65536;2:0;4:6291456;6:262144;4:1048576|15663105|1:0:0:256|m,a,s,p2
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.1

TCP SYN (p0f)

fingerprintco-occurrences
4:57+7:0:1436:mss*45,7:mss,sok,ts,nop,ws:df,id+:025
4:54+10:0:1436:mss*45,7:mss,sok,ts,nop,ws:df,id+:014
4:48+16:0:1436:mss*45,7:mss,sok,ts,nop,ws:df,id+:02
4:54+10:0:1436:mss*45,7:mss,sok,ts,nop,ws:df:01
4:53+11:0:1436:mss*45,7:mss,sok,ts,nop,ws:df,id+:01

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (iPhone; CPU iPhone OS 18_4 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/18.4 Mobile/15E148 Safari/604.113
Mozilla/5.0 (compatible; DeepSeekBot/1.0; +https://www.deepseek.com/bot)3
Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)2
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/148.0.0.0 Safari/537.362
Mozilla/5.0 (compatible; YandexBot/3.0; +http://yandex.com/bots)2
Mozilla/5.0 (compatible; OAI-SearchBot/1.3; +https://openai.com/searchbot)2
Mozilla/5.0 (compatible; bingbot/2.0; +http://www.bing.com/bingbot.htm)2
Mozilla/5.0 (compatible; ClaudeBot/1.0; +claudebot@anthropic.com)2
Mozilla/5.0 (compatible; Google-CloudVertexBot; +https://cloud.google.com/vertex-ai-bot)2
Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; GPTBot/1.3; +https://openai.com/gptbot)2

Country

fingerprintco-occurrences
US · United States25
DE · Germany13
LU · Luxembourg2
SE · Sweden2
PL · Poland1

Network (ASN)

fingerprintco-occurrences
AS400529 · Infraly, LLC25
AS3320 · Deutsche Telekom AG13
AS205759 · Ghosty Networks LLC2
AS198189 · Throttle Limited2
AS214481 · Wojciech Czapkowicz1

TLS supported groups

fingerprintco-occurrences
11ec,001d,0017,001e,0018,0019,0100,0101 Match?Exact match in Thumbprint's published controlled catalog captures: node-fetch 24.22.1, python-httpx 0.28.1, python-requests 2.34.2, +2 more.The fingerprint page shows the full measured match list. More on the catalog.1