TCP SYN (JA4T)

62720_2-4-8-1-3_8960_7

first seen 2026-07-01 14:37 · last seen 2026-10-23 22:38 · JSON

Distinct clients per day (last 30 days, peak 2/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	`62720`
Option kinds	`2-4-8-1-3`
MSS	`8960`
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
`t13d1512h2_8daaf6152771_cbb9361b6bf9`	6
`t13d1516h2_8daaf6152771_e5627efa2ab1`	2
`t13d1510h2_8daaf6152771_560390466015`	2
`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.	1
`t13d251100_b78ed14e2fd0_ab7e3b40a677`	1
`t13d1515h2_8daaf6152771_de4a06bb82e3`	1
`t13d3113h2_e8f1e7e78f70_ce5650b735ce`	1
`t13d3013h2_1d37bd780c83_8537cf56674e`	1
`t13d1717h2_5b57614c22b0_3cbfd9057e0d` Match?Exact match in Thumbprint's published controlled catalog captures: firefox 148.0.2, firefox 144.0.2, firefox 142.0.1, +6 more.The fingerprint page shows the full measured match list. More on the catalog.	1
`t13d1515h1_8daaf6152771_0a20fe35d3a5`	1

HTTP request (JA4H)

fingerprint	co-occurrences
`ge20nn04enus_989c7cc05c9b_000000000000_000000000000`	52
`ge20nn12enus_60f823d07c94_000000000000_000000000000`	2
`ge20nn020000_b89ce445e0b3_000000000000_000000000000` Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.21.13, go-net/http 1.27.1, go-net/http 1.27.0, +14 more.The fingerprint page shows the full measured match list. More on the catalog.	2
`ge20nn020000_5594a17e7e7e_000000000000_000000000000` Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.7.1, curl 8.5.0, curl 8.13.0, +11 more.The fingerprint page shows the full measured match list. More on the catalog.	1
`ge20nn11enus_3901d4197baf_000000000000_000000000000` Match?Exact match in Thumbprint's published controlled catalog captures: firefox 154.0, firefox 152.0.5, firefox 153.0.1, +3 more.The fingerprint page shows the full measured match list. More on the catalog.	1
`ge20nn120000_1d5643f8516d_000000000000_000000000000` Match?Exact match in Thumbprint's published controlled catalog captures: chromium 151.0.7922.34, chromium 153.0.8010.12, chromium 156.0.8078.4, +13 more.The fingerprint page shows the full measured match list. More on the catalog.	1
`ge11nr050000_57c5e92682a8_000000000000_000000000000`	1
`ge11nn13enus_9db22d02e17a_000000000000_000000000000`	1
`ge20nn030000_bf75ddd0bb29_000000000000_000000000000`	1
`ge11nn06enus_98e697c2fa06_000000000000_000000000000`	1

HTTP/2 frames (Akamai)

fingerprint	co-occurrences
`1:65536;2:0;4:6291456;6:262144;4:1048576\|15663105\|1:0:0:256\|m,a,s,p`	52
`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.	2
`1:65536;2:0;3:1000;4:6291456;6:262144\|15663105\|1:1:0:256\|m,a,s,p`	2
`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
`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, +57 more.The fingerprint page shows the full measured match list. More on the catalog.	1
`3:100;4:33554432;2:0\|33488897\|0\|m,p,s,a` Match?Exact match in Thumbprint's published controlled catalog captures: php-curl 7.88.1, curl 7.88.1.The fingerprint page shows the full measured match list. More on the catalog.	1
`1:65536;2:0;4:131072;5:16384\|12517377\|1:0:0:42\|m,p,a,s`	1

TCP SYN (p0f)

fingerprint	co-occurrences
`4:52+12:0:8960:mss*7,7:mss,sok,ts,nop,ws:df,id+:0`	33
`4:51+13:0:8960:mss*7,7:mss,sok,ts,nop,ws:df,id+:0`	9
`4:54+10:0:8960:mss*7,7:mss,sok,ts,nop,ws:df,id+:0`	7
`4:47+17:0:8960:mss*7,7:mss,sok,ts,nop,ws:df,id+:0`	6
`4:57+7:0:8960:mss*7,7:mss,sok,ts,nop,ws:df,id+:0`	5
`4:49+15:0:8960:mss*7,7:mss,sok,ts,nop,ws:df,id+:0`	1
`4:39+25:0:8960:mss*7,7:mss,sok,ts,nop,ws:df,id+:0`	1
`4:43+21:0:8960:mss*7,7:mss,sok,ts,nop,ws:df,id+:0`	1

User-Agent

fingerprint	co-occurrences
`Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/135.0.0.6 Safari/537.36`	5
`Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/135.0.0.9 Safari/537.36`	4
`Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/135.0.0.7 Safari/537.36`	3
`Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/135.0.0.3 Safari/537.36 Edg/135.0.0.3`	3
`Go-http-client/2.0`	2
`Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/135.0.0.4 Safari/537.36`	2
`Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/135.0.0.3 Safari/537.36`	2
`Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/123.0.0.0 Safari/537.36`	1
`Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/135.0.0.0 Safari/537.36 Edg/135.0.0.0`	1
`Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/135.0.0.0 Safari/537.36`	1

Country

fingerprint	co-occurrences
`FR` · France	41
`SE` · Sweden	11
`US` · United States	7
`TR` · Turkey	3
`NL` · Netherlands	1

Network (ASN)

fingerprint	co-occurrences
`AS213873` · OUIDO Hosting	41
`AS31898` · Oracle Corporation	6
`AS214503` · QuxLabs AB	5
`AS33837` · Fredrik Holmqvist	5
`AS44382` · Fiba Cloud Operation Company, LLC	3
`AS30893` · No ACK Group Holding AB	1
`AS62744` · Quintex Alliance Consulting	1
`AS41436` · Kamatera Inc	1

TLS supported groups

fingerprint	co-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

fingerprint	co-occurrences
`1:65536;2:0;4:6291456;6:262144;4:1048576\|15663105\|1:0:0:256\|m,a,s,p`	52
`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.	2
`1:65536;2:0;3:1000;4:6291456;6:262144\|15663105\|1:1:0:256\|m,a,s,p`	2
`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
`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, +57 more.The fingerprint page shows the full measured match list. More on the catalog.	1
`3:100;4:33554432;2:0\|33488897\|0\|m,p,s,a` Match?Exact match in Thumbprint's published controlled catalog captures: php-curl 7.88.1, curl 7.88.1.The fingerprint page shows the full measured match list. More on the catalog.	1
`1:65536;2:0;4:131072;5:16384\|12517377\|1:0:0:42\|m,p,a,s`	1