TCP SYN (JA4T)

65535_2-4-8-1-3_1460_7

first seen 2026-08-03 18:47 · last seen 2026-10-18 09:30 · JSON

Distinct clients per day (last 30 days, peak 1/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	`2-4-8-1-3`
MSS	`1460`
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
`t13d1515h1_8daaf6152771_de4a06bb82e3`	14
`t13d1517h2_8daaf6152771_3cbfd9057e0d` Match?Exact match in Thumbprint's published controlled catalog captures: firefox 155.0.1, firefox 154.0, firefox 156.0, +8 more.The fingerprint page shows the full measured match list. More on the catalog.	8
`t13d1515h1_8daaf6152771_0a20fe35d3a5`	6
`t13d1516h2_8daaf6152771_02713d6af862` Match?Exact match in Thumbprint's published controlled catalog captures: chromium 131.0.6778.33, chromium 134.0.6998.35, chromium 133.0.6943.16.The fingerprint page shows the full measured match list. More on the catalog.	1
`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
`t13d3113h2_e8f1e7e78f70_1b3407e2c936`	1
`t13d1516h1_8daaf6152771_1a63afa7c478`	1
`t13d1410h2_9c3e8501550e_560390466015`	1
`t13d1511h2_8daaf6152771_b11bb3600f94`	1
`t13d1411h2_8d02cddff4d4_9ced094328c9`	1

HTTP request (JA4H)

fingerprint	co-occurrences
`ge11nn13enus_9db22d02e17a_000000000000_000000000000`	18
`ge20nn04enus_989c7cc05c9b_000000000000_000000000000`	8
`ge20nr11en00_3901d4197baf_000000000000_000000000000`	5
`ge11nn14enus_4a2973d235de_000000000000_000000000000`	3
`ge20nn10en00_b3034183f430_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 8.13.0, +11 more.The fingerprint page shows the full measured match list. More on the catalog.	1
`ge20nn12enus_60f823d07c94_000000000000_000000000000`	1
`ge20nr020000_5594a17e7e7e_000000000000_000000000000`	1
`ge20nn10en00_d353d425b0bb_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`	8
`1:65536;2:0;4:131072;5:16384\|12517377\|3:0:0:22\|m,p,a,s` Match?Exact match in Thumbprint's published controlled catalog captures: firefox 153.0, firefox 153.0.3, firefox 155.0.1, +32 more.The fingerprint page shows the full measured match list. More on the catalog.	2
`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, +60 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\|3:0:0:42\|m,p,a,s` Match?Exact match in Thumbprint's published controlled catalog captures: firefox 154.0, firefox 152.0.5, firefox 152.0.1, +3 more.The fingerprint page shows the full measured match list. More on the catalog.	1
`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
`1:65536;2:0;4:131072;5:16384\|12517377\|9:0:0:42\|m,p,a,s`	1
`1:65536;2:0;4:131072;5:16384\|12517377\|11:0:0:42\|m,p,a,s`	1
`1:65536;2:0;4:131072;5:16384\|12517377\|13:0:0:42\|m,p,a,s`	1
`1:65536;2:0;4:131072;5:16384\|12517377\|15:0:0:42\|m,p,a,s`	1

TCP SYN (p0f)

fingerprint	co-occurrences
`4:46+18:0:1460:65535,7:mss,sok,ts,nop,ws:df,id+:0`	10
`4:47+17:0:1460:65535,7:mss,sok,ts,nop,ws:df,id+:0`	10
`4:50+14:0:1460:65535,7:mss,sok,ts,nop,ws:df,id+:0`	5
`4:53+11:0:1460:65535,7:mss,sok,ts,nop,ws:df,id+:0`	5
`4:45+19:0:1460:65535,7:mss,sok,ts,nop,ws:df,id+:0`	4
`4:51+13:0:1460:65535,7:mss,sok,ts,nop,ws:df,id+:0`	4
`4:52+12:0:1460:65535,7:mss,sok,ts,nop,ws:df,id+:0`	1
`4:48+16:0:1460:65535,7:mss,sok,ts,nop,ws:df,id+:0`	1

User-Agent

fingerprint	co-occurrences
`Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/152.0.0.0 Safari/537.36`	8
`Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/104.0.0.0 Safari/537.36`	4
`Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/100.0.4896.75 Safari/537.36`	3
`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`	2
`Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/119.0.0.0 Safari/537.36`	2
`Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/107.0.0.0 Safari/537.36`	2
`Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/99.0.4844.51 Safari/537.36`	2
`Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/101.0.4951.67 Safari/537.36`	2
`Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36`	1
`Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/136.0.0.0 Safari/537.36`	1

Country

fingerprint	co-occurrences
`US` · United States	18
`NO` · Norway	11
`CA` · Canada	3
`GB` · United Kingdom	3
`IE` · Ireland	2
`EE` · Estonia	1
`NZ` · New Zealand	1
`JM` · Jamaica	1

Network (ASN)

fingerprint	co-occurrences
`AS56655` · Gigahost AS	11
`AS396507` · Emerald Onion	7
`AS701` · Verizon Business	3
`AS5466` · Eircom Limited	2
`AS12271` · Charter Communications Inc	1
`AS7922` · Comcast Cable Communications, LLC	1
`AS5089` · Virgin Media Limited	1
`AS6128` · Cablevision Systems Corp.	1
`AS20001` · Charter Communications Inc	1
`AS852` · TELUS Communications Inc.	1

TLS supported groups

fingerprint	co-occurrences
`001d,0017,001e,0019,0018`	1
`0a0a,001d,0017,0018`	1

fingerprint	co-occurrences
`1:65536;2:0;4:6291456;6:262144;4:1048576\|15663105\|1:0:0:256\|m,a,s,p`	8
`1:65536;2:0;4:131072;5:16384\|12517377\|3:0:0:22\|m,p,a,s` Match?Exact match in Thumbprint's published controlled catalog captures: firefox 153.0, firefox 153.0.3, firefox 155.0.1, +32 more.The fingerprint page shows the full measured match list. More on the catalog.	2
`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, +60 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\|3:0:0:42\|m,p,a,s` Match?Exact match in Thumbprint's published controlled catalog captures: firefox 154.0, firefox 152.0.5, firefox 152.0.1, +3 more.The fingerprint page shows the full measured match list. More on the catalog.	1
`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
`1:65536;2:0;4:131072;5:16384\|12517377\|9:0:0:42\|m,p,a,s`	1
`1:65536;2:0;4:131072;5:16384\|12517377\|11:0:0:42\|m,p,a,s`	1
`1:65536;2:0;4:131072;5:16384\|12517377\|13:0:0:42\|m,p,a,s`	1
`1:65536;2:0;4:131072;5:16384\|12517377\|15:0:0:42\|m,p,a,s`	1