TCP SYN (JA4T)

26883_2-4-8-1-3_1460_12

first seen 2026-07-01 14:32 · last seen 2026-10-27 12:18 · JSON

Last 7 days (1 observations)

Distinct clients per day (last 30 days, peak 4/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 window26883
Option kinds2-4-8-1-3
MSS1460
Window scale12

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
t13d3113h1_e8f1e7e78f70_ce5650b735ce Match?Exact match in Thumbprint's published controlled catalog captures: php-guzzle 8.2.0, php-guzzle 8.1.0, php-guzzle 8.3.1, +4 more.The fingerprint page shows the full measured match list. More on the catalog.74
t13d1312h2_f57a46bbacb6_ab7e3b40a677 Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.26.6, go-net/http 1.26.10, go-net/http 1.26.9, +7 more.The fingerprint page shows the full measured match list. More on the catalog.1

HTTP request (JA4H)

fingerprintco-occurrences
ge11nn050000_fc779ac3aeeb_000000000000_00000000000073
ge11nn040000_e1d2031bdfea_000000000000_0000000000001
ge20nn030000_bf75ddd0bb29_000000000000_0000000000001

HTTP/2 frames (Akamai)

fingerprintco-occurrences
2:0;4:4194304;5:16384;6:10485760|1073741824|0|a,m,p,s Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.26.6, go-net/http 1.26.10, go-net/http 1.26.9, +8 more.The fingerprint page shows the full measured match list. More on the catalog.1

TCP SYN (p0f)

fingerprintco-occurrences
4:54+10:0:1460:26883,12:mss,sok,ts,nop,ws:df,id+:043
4:56+8:0:1460:26883,12:mss,sok,ts,nop,ws:df,id+:014
4:53+11:0:1460:26883,12:mss,sok,ts,nop,ws:df,id+:08
4:50+14:0:1460:26883,12:mss,sok,ts,nop,ws:df,id+:06
4:57+7:0:1460:26883,12:mss,sok,ts,nop,ws:df,id+:03
4:48+16:0:1460:26883,12:mss,sok,ts,nop,ws:df,id+:01

User-Agent

fingerprintco-occurrences
Slackbot-LinkExpanding 1.0 (+https://api.slack.com/robots)74
Slack-ImgProxy (+https://api.slack.com/robots)1

Country

fingerprintco-occurrences
US · United States74
DE · Germany1

Network (ASN)

fingerprintco-occurrences
AS14618 · Amazon.com, Inc.74
AS16509 · Amazon.com, Inc.1

TLS supported groups

fingerprintco-occurrences
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.3