TCP SYN (JA4T)

64952_2-4-8-1-3_1412_7

first seen 2026-07-03 07:29 · last seen 2026-09-16 04:44 · JSON

Last 7 days (12 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	`64952`
Option kinds	`2-4-8-1-3`
MSS	`1412`
Window scale	`7`

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
`t13d191000_9dc949149365_e7c285222651`	61
`t13d251000_b78ed14e2fd0_e7c285222651`	52
`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.	28
`t13i170900_5b57614c22b0_78e6aca7449b`	6
`t13d1911h2_9dc949149365_e7c285222651` Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.21.13.The fingerprint page shows the full measured match list. More on the catalog.	4
`t13d3112h2_e8f1e7e78f70_b26ce05bbdd6` Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.5.0, php-curl 7.88.1.The fingerprint page shows the full measured match list. More on the catalog.	1
`t13d1812h1_85036bcba153_b26ce05bbdd6`	1

HTTP request (JA4H)

fingerprint	co-occurrences
`ge11nn040000_8391bea91fb6_000000000000_000000000000`	58
`ge11nr050000_57c5e92682a8_000000000000_000000000000`	52
`ge11nr05zhcn_f3bb7aa45ec4_000000000000_000000000000`	28
`ge20nr010000_73b42ef9ea4d_000000000000_000000000000`	4
`ge11nn030000_32287c24fa5b_000000000000_000000000000`	3
`ge11nn070000_d0d63ed74832_000000000000_000000000000`	2
`ge11nn050000_c71bbc472f37_000000000000_000000000000`	2
`ge20nn020000_5594a17e7e7e_000000000000_000000000000` Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.7.1, curl 8.5.0, curl 8.18.0, +9 more.The fingerprint page shows the full measured match list. More on the catalog.	1
`ge11nr07zh00_85369b05879d_000000000000_000000000000`	1
`ge11nn070000_f395b2c4bb38_000000000000_000000000000`	1

HTTP/2 frames (Akamai)

fingerprint	co-occurrences
`2:0;4:4194304;6:10485760\|1073741824\|0\|a,m,p,s` Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.21.13, go-net/http 1.23.12.The fingerprint page shows the full measured match list. More on the catalog.	4
`3:100;4:10485760;2:0\|1048510465\|0\|m,s,a,p` Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.7.1, curl 8.5.0.The fingerprint page shows the full measured match list. More on the catalog.	1

TCP SYN (p0f)

fingerprint	co-occurrences
`4:49+15:0:1412:mss*46,7:mss,sok,ts,nop,ws:df,id+:0`	44
`4:44+20:0:1412:mss*46,7:mss,sok,ts,nop,ws:df,id+:0`	28
`4:43+21:0:1412:mss*46,7:mss,sok,ts,nop,ws:df,id+:0`	18
`4:45+19:0:1412:mss*46,7:mss,sok,ts,nop,ws:df,id+:0`	13
`4:47+17:0:1412:mss*46,7:mss,sok,ts,nop,ws:df,id+:0`	12
`4:50+14:0:1412:mss*46,7:mss,sok,ts,nop,ws:df,id+:0`	10
`4:46+18:0:1412:mss*46,7:mss,sok,ts,nop,ws:df,id+:0`	10
`4:48+16:0:1412:mss*46,7:mss,sok,ts,nop,ws:df,id+:0`	10
`4:41+23:0:1412:mss*46,7:mss,sok,ts,nop,ws:df,id+:0`	2
`4:40+24:0:1412:mss*46,7:mss,sok,ts,nop,ws:df,id+:0`	2

User-Agent

fingerprint	co-occurrences
`Go-http-client/1.1`	36
`Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36 Edg/120.0.0.0`	28
`libredtail-http`	6
`curl/7.29.0`	3
`Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/66.0.3359.139 Safari/537.36`	2
`Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:134.0) Gecko/20100101 Firefox/134.0`	1
`Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:65.0) Gecko/20100101 Firefox/65.0`	1
`Mozilla/5.0 (X11; Linux x86_64; rv:132.0) Gecko/20100101 Firefox/132.0`	1
`Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_6) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/14.1 Safari/605.1.15`	1
`Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11) AppleWebKit/601.1.27 (KHTML, like Gecko) Chrome/47.0.2526.106 Safari/601.1.27`	1

Country

fingerprint	co-occurrences
`US` · United States	64
`HK` · Hong Kong SAR China	38
`TH` · Thailand	20
`JP` · Japan	8
`CN` · China	8
`GB` · United Kingdom	5
`DE` · Germany	3
`RU` · Russia	3
`NG` · Nigeria	2
`SG` · Singapore	1

Network (ASN)

fingerprint	co-occurrences
`AS135377` · UCLOUD INFORMATION TECHNOLOGY (HK) LIMITED	141
`AS23724` · IDC, China Telecommunications Corporation	4
`AS58466` · CHINANET Guangdong province network	4
`AS142002` · Scloud Pte Ltd	3
`AS2914` · NTT America, Inc.	1