TCP SYN (JA4T)

65535_2-4-8-1-3_1460_13

first seen 2026-07-01 14:32 · last seen 2026-11-01 03:40 · JSON

Last 7 days (8 observations)

Distinct clients per day (last 30 days, peak 6/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	`13`

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
`t13d1312h2_a44d0ee8b3cc_e381dae6da6b`	139
`t13d1617h2_86a278354501_3cbfd9057e0d` Match?Exact match in Thumbprint's published controlled catalog captures: firefox 153.0, firefox 153.0.3, firefox 152.0.3, +10 more.The fingerprint page shows the full measured match list. More on the catalog.	5
`t13d1311h2_a44d0ee8b3cc_485d6013ba69`	1

HTTP request (JA4H)

fingerprint	co-occurrences
`ge20nn090000_6c95df8859bf_000000000000_000000000000`	32
`ge20nn090000_2b87eda31960_000000000000_000000000000`	25
`ge20nn080000_3b4736f856c0_000000000000_000000000000`	19
`ge20nn18enus_f19a7ce03b58_000000000000_000000000000`	10
`ge20nn080000_eab49c6106e6_000000000000_000000000000`	8
`ge20nn19enus_6d96c1a2ad8a_000000000000_000000000000`	7
`ge20nn11enus_3e96b3a49e4b_000000000000_000000000000`	6
`ge20nn100000_806fbb41f745_000000000000_000000000000`	5
`ge20nn070000_1c05be67a921_000000000000_000000000000`	4
`ge20nr10fr00_b3034183f430_000000000000_000000000000`	4

HTTP/2 frames (Akamai)

fingerprint	co-occurrences
`2:0;3:1;4:8388608;5:65536\|8323073\|0\|m,s,a,p`	140
`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;4:131072;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
`1:65536;2:0;4:131072;5:16384\|12517377\|5:0:0:22\|m,p,a,s` Match?Exact match in Thumbprint's published controlled catalog captures: firefox 153.0.3, firefox 154.0, firefox 153.0, +13 more.The fingerprint page shows the full measured match list. More on the catalog.	1
`1:65536;2:0;4:131072;5:16384\|12517377\|7:0:0:22\|m,p,a,s` Match?Exact match in Thumbprint's published controlled catalog captures: firefox 153.0.3, firefox 158.0.1, firefox 155.0, +4 more.The fingerprint page shows the full measured match list. More on the catalog.	1

TCP SYN (p0f)

fingerprint	co-occurrences
`4:55+9:0:1460:65535,13:mss,sok,ts,nop,ws:df,id+:0`	40
`4:52+12:0:1460:65535,13:mss,sok,ts,nop,ws:df,id+:0`	31
`4:51+13:0:1460:65535,13:mss,sok,ts,nop,ws:df,id+:0`	17
`4:54+10:0:1460:65535,13:mss,sok,ts,nop,ws:df,id+:0`	12
`4:50+14:0:1460:65535,13:mss,sok,ts,nop,ws:df,id+:0`	12
`4:47+17:0:1460:65535,13:mss,sok,ts,nop,ws:df,id+:0`	9
`4:56+8:0:1460:65535,13:mss,sok,ts,nop,ws:df,id+:0`	9
`4:53+11:0:1460:65535,13:mss,sok,ts,nop,ws:df,id+:0`	8
`4:41+23:0:1460:65535,13:mss,sok,ts,nop,ws:df,id+:0`	5
`4:48+16:0:1460:65535,13:mss,sok,ts,nop,ws:df,id+:0`	2

User-Agent

fingerprint	co-occurrences
`Mozilla/5.0 (compatible; SquareTownBot/1.0; +https://square.pov.town)`	33
`Mozilla/5.0 (compatible; GCombinator/1.0; +https://news.gcombinator.com)`	20
`Mozilla/5.0 (compatible; HNBot/1.0)`	17
`Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/126.0.0.0 Safari/537.36`	7
`Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:152.0) Gecko/20100101 Firefox/152.0`	5
`Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/125.0.0.0 Safari/537.36`	4
`Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/135.0.0.0 Safari/537.36`	4
`Mozilla/5.0 (compatible; bot/1.0)`	4
`Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)`	3
`Mozilla/5.0 (Linux; Android 14; Pixel 8) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/135.0.6422.113 Mobile Safari/537.36`	3

Country

fingerprint	co-occurrences
`US` · United States	54
`SG` · Singapore	39
`DE` · Germany	9
`NL` · Netherlands	8
`FR` · France	7
`RE` · Réunion	5
`AU` · Australia	4
`IN` · India	4
`DK` · Denmark	4
`BR` · Brazil	2

Network (ASN)

fingerprint	co-occurrences
`AS13335` · Cloudflare, Inc.	140
`AS49902` · SOCIETE REUNIONNAISE DU RADIOTELEPHONE SCS	5

TLS supported groups

fingerprint	co-occurrences
`001d,0017,0018,0019,11ec,6399,fe32`	20

fingerprint	co-occurrences
`2:0;3:1;4:8388608;5:65536\|8323073\|0\|m,s,a,p`	140
`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;4:131072;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
`1:65536;2:0;4:131072;5:16384\|12517377\|5:0:0:22\|m,p,a,s` Match?Exact match in Thumbprint's published controlled catalog captures: firefox 153.0.3, firefox 154.0, firefox 153.0, +13 more.The fingerprint page shows the full measured match list. More on the catalog.	1
`1:65536;2:0;4:131072;5:16384\|12517377\|7:0:0:22\|m,p,a,s` Match?Exact match in Thumbprint's published controlled catalog captures: firefox 153.0.3, firefox 158.0.1, firefox 155.0, +4 more.The fingerprint page shows the full measured match list. More on the catalog.	1