TCP SYN (JA4T)

26883_2-4-8-1-3_1460_12

first seen 2026-07-01 14:32 · last seen 2026-09-15 21:44 · JSON

Last 7 days (10 observations)

Distinct clients per day (last 30 days, peak 5/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 window	`26883`
Option kinds	`2-4-8-1-3`
MSS	`1460`
Window scale	`12`

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)

fingerprint	co-occurrences
`t13d3113h1_e8f1e7e78f70_ce5650b735ce` Match?Exact match in Thumbprint's published controlled catalog captures: php-guzzle 8.1.0, php-guzzle 8.2.0, php-guzzle 8.0.2, +2 more.The fingerprint page shows the full measured match list. More on the catalog.	37
`t13d1312h2_f57a46bbacb6_ab7e3b40a677` Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.26.6, go-net/http 1.26.8, go-net/http 1.26.7, +5 more.The fingerprint page shows the full measured match list. More on the catalog.	1

HTTP request (JA4H)

fingerprint	co-occurrences
`ge11nn050000_fc779ac3aeeb_000000000000_000000000000`	36
`ge20nn030000_bf75ddd0bb29_000000000000_000000000000`	1
`ge11nn040000_e1d2031bdfea_000000000000_000000000000`	1

HTTP/2 frames (Akamai)

fingerprint	co-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 1.26.8, go-net/http 1.26.7, +6 more.The fingerprint page shows the full measured match list. More on the catalog.	1

TCP SYN (p0f)

fingerprint	co-occurrences
`4:56+8:0:1460:26883,12:mss,sok,ts,nop,ws:df,id+:0`	14
`4:54+10:0:1460:26883,12:mss,sok,ts,nop,ws:df,id+:0`	12
`4:53+11:0:1460:26883,12:mss,sok,ts,nop,ws:df,id+:0`	8
`4:50+14:0:1460:26883,12:mss,sok,ts,nop,ws:df,id+:0`	3
`4:48+16:0:1460:26883,12:mss,sok,ts,nop,ws:df,id+:0`	1

User-Agent

fingerprint	co-occurrences
`Slackbot-LinkExpanding 1.0 (+https://api.slack.com/robots)`	37
`Slack-ImgProxy (+https://api.slack.com/robots)`	1

Country

fingerprint	co-occurrences
`US` · United States	37
`DE` · Germany	1

Network (ASN)

fingerprint	co-occurrences
`AS14618` · Amazon.com, Inc.	37
`AS16509` · Amazon.com, Inc.	1