TCP SYN (JA4T)

65535_2-4-8-1-3_1460_14

first seen 2026-06-30 14:58 · last seen 2026-10-30 22:44 · JSON

Last 7 days (44 observations)

Distinct clients per day (last 30 days, peak 4102/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 window65535
Option kinds2-4-8-1-3
MSS1460
Window scale14

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
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.18794
t13d131100_f57a46bbacb6_ab7e3b40a677 Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.26.6, go-net/http 1.26.5, go-net/http 1.26.4.The fingerprint page shows the full measured match list. More on the catalog.2
t13d1516h2_8daaf6152771_e5627efa2ab11

HTTP request (JA4H)

fingerprintco-occurrences
ge20nn060000_2a1d139103bd_000000000000_00000000000018794
ge11nr040000_e1d2031bdfea_000000000000_0000000000001
ge11nn040000_e1d2031bdfea_000000000000_0000000000001
ge20nn13enus_0c2c1d640f3e_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: chrome 151.0.7922.137, chrome 151.0.7922.170, chrome 151.0.7922.108, +36 more.The fingerprint page shows the full measured match list. More on the catalog.1

HTTP/2 frames (Akamai)

fingerprintco-occurrences
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.18794
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

TCP SYN (p0f)

fingerprintco-occurrences
4:47+17:0:1460:65535,14:mss,sok,ts,nop,ws:df,id+,ecn:05451
4:48+16:0:1460:65535,14:mss,sok,ts,nop,ws:df,id+,ecn:04702
4:45+19:0:1460:65535,14:mss,sok,ts,nop,ws:df,id+,ecn:04490
4:46+18:0:1460:65535,14:mss,sok,ts,nop,ws:df,id+,ecn:01789
4:49+15:0:1460:65535,14:mss,sok,ts,nop,ws:df,id+,ecn:01389
4:44+20:0:1460:65535,14:mss,sok,ts,nop,ws:df,id+,ecn:0960
4:48+16:0:1460:65535,14:mss,sok,ts,nop,ws:df,id+:07
4:47+17:0:1460:65535,14:mss,sok,ts,nop,ws:df,id+:05
4:45+19:0:1460:65535,14:mss,sok,ts,nop,ws:df,id+:02
4:54+10:0:1460:65535,14:mss,sok,ts,nop,ws:df,id+,ecn:01

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (compatible; AhrefsBot/7.0; +http://ahrefs.com/robot/)18794
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0.0.0 Safari/537.362
Mozilla/5.0 (Linux; Android 10; K) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Mobile Safari/537.361

Country

fingerprintco-occurrences
US · United States6079
CA · Canada3892
GB · United Kingdom3558
FR · France3345
DE · Germany1923

Network (ASN)

fingerprintco-occurrences
AS16276 · OVH SAS18787
AS140577 · Ahrefs Pte Ltd9
AS906 · DMIT Cloud Services1

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.116