TCP SYN (JA4T)

65535_2-1-1-4-1-3_1460_9

first seen 2026-07-11 06:57 · last seen 2026-09-15 21:29 · JSON

Last 7 days (17 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	`65535`
Option kinds	`2-1-1-4-1-3`
MSS	`1460`
Window scale	`9`

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
`t12d290700_fc2078a0b8c0_8c06664c3ac5`	20
`t13d1516h2_8daaf6152771_d8a2da3f94cd` Match?Exact match in Thumbprint's published controlled catalog captures: chromium 149.0.7827.102, chrome 149.0.7827.102, chrome 149.0.7827.156, +25 more.The fingerprint page shows the full measured match list. More on the catalog.	17
`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.	2

HTTP request (JA4H)

fingerprint	co-occurrences
`ge20nn13zhcn_0c2c1d640f3e_000000000000_000000000000`	17
`ge11nn040000_bfa5a9b89dd6_000000000000_000000000000`	10
`ge11nn06en00_3011d71998e2_000000000000_000000000000`	10
`ge11nn030000_cd680697de12_000000000000_000000000000` Match?Exact match in Thumbprint's published controlled catalog captures: powershell 7.6.5, powershell 7.6.4, go-net/http 1.27.0, +7 more.The fingerprint page shows the full measured match list. More on the catalog.	2

HTTP/2 frames (Akamai)

fingerprint	co-occurrences
`1:65536;2:0;4:6291456;6:262144\|15663105\|1:1:0:256\|m,a,s,p` Match?Exact match in Thumbprint's published controlled catalog captures: chromium 131.0.6778.33, chromium 151.0.7922.34, chrome 151.0.7922.137, +43 more.The fingerprint page shows the full measured match list. More on the catalog.	12
`1:65536;2:0;4:6291456;6:262144\|15663105\|3:1:0:256\|m,a,s,p`	5

TCP SYN (p0f)

fingerprint	co-occurrences
`4:46+18:0:1460:65535,9:mss,nop,nop,sok,nop,ws::0`	20
`4:47+17:0:1460:65535,9:mss,nop,nop,sok,nop,ws:df,id+:0`	7
`4:46+18:0:1460:65535,9:mss,nop,nop,sok,nop,ws:df,id+:0`	4
`4:44+20:0:1460:65535,9:mss,nop,nop,sok,nop,ws:df,id+:0`	3
`4:48+16:0:1460:65535,9:mss,nop,nop,sok,nop,ws:df,id+:0`	3
`4:43+21:0:1460:65535,9:mss,nop,nop,sok,nop,ws:df,id+:0`	1
`4:49+15:0:1460:65535,9:mss,nop,nop,sok,nop,ws:df,id+:0`	1

User-Agent

fingerprint	co-occurrences
`Mozilla/5.0 (compatible; MJ12bot/v1.4.8; http://mj12bot.com/)`	20
`Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/144.0.0.0 Safari/537.36`	17
`Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/125.0.0.0 Safari/537.36`	1
`Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/125.0.0.0 Safari/537.36`	1

Country

fingerprint	co-occurrences
`FI` · Finland	20
`CN` · China	17
`FR` · France	2

Network (ASN)

fingerprint	co-occurrences
`AS24940` · Hetzner Online GmbH	20
`AS4808` · China Unicom Beijing Province Network	7
`AS4812` · China Telecom (Group)	4
`AS4134` · CHINANET BACKBONE	3
`AS211590` · Bucklog SARL	2
`AS4811` · China Telecom (Group)	1
`AS56044` · China Mobile communications corporation	1
`AS136195` · Qingdao, Shandong Province, P.R.China.	1