TCP SYN (JA4T)

65535_2-4-8-1-3_1460_11

first seen 2026-07-01 15:07 · last seen 2026-10-31 09:50 · JSON

Last 7 days (1 observations)

Distinct clients per day (last 30 days, peak 4/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 scale11

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
t13d2014h2_a09f3c656075_e42f34c56612 Match?Exact match in Thumbprint's published controlled catalog captures: safari 26.5.2, safari 26.5, safari 26.6.1, +1 more.The fingerprint page shows the full measured match list. More on the catalog.11
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.8
t13d3013h2_1d37bd780c83_8537cf56674e4
t13d131100_f57a46bbacb6_e5728521abd42
t13d591000_a33745022dd6_1f22a2ca17c42
t13d4412h1_fd39b124ee10_58ed7828516f2
t13d4312h1_c7886603b240_b26ce05bbdd61
t13d251100_b78ed14e2fd0_ab7e3b40a6771
t12d130600_2d7513195f68_e51b7354d87f1
t13d1812h1_85036bcba153_d41ae481755e1

HTTP request (JA4H)

fingerprintco-occurrences
ge20nr030000_ff50983941c1_000000000000_0000000000004
ge20nn030000_bf75ddd0bb29_000000000000_0000000000004
ge20nr07zhcn_0195bc40dc9f_000000000000_0000000000004
ge11nn050000_b223a0ebb0b5_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: python-requests 2.34.2, python-requests 2.33.1, python-requests 2.32.3.The fingerprint page shows the full measured match list. More on the catalog.3
ge20nr08zhcn_0a5873f4dd2b_000000000000_0000000000003
ge11nr030000_cd680697de12_000000000000_0000000000002
ge20nr04enus_39a3ba4480e8_000000000000_0000000000002
ge11nn13enus_9db22d02e17a_000000000000_0000000000002
ge11nn07enus_71b742b5154a_000000000000_0000000000002
ge20nn05zhcn_0f1b229de16a_000000000000_0000000000002

HTTP/2 frames (Akamai)

fingerprintco-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.8
2:0;4:2097152;3:100|10485760|0|m,s,p,a5
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.4
2:0;4:2097152;3:100|10485760|1:0:0:255|m,s,p,a2
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
2:0;4:2097152;3:100|10485760|7:0:0:255|m,s,p,a1
2:0;4:2097152;3:100|10485760|9:0:0:255|m,s,p,a1
2:0;4:2097152;3:100|10485760|11:0:0:255|m,s,p,a1
2:0;4:2097152;3:100|10485760|13:0:0:255|m,s,p,a1

TCP SYN (p0f)

fingerprintco-occurrences
4:51+13:0:1460:65535,11:mss,sok,ts,nop,ws:df,id+:012
4:53+11:0:1460:65535,11:mss,sok,ts,nop,ws:df,id+:07
4:50+14:0:1460:65535,11:mss,sok,ts,nop,ws:df,id+:04
4:45+19:0:1460:65535,11:mss,sok,ts,nop,ws:df,id+:03
4:48+16:0:1460:65535,11:mss,sok,ts,nop,ws:df,id+:02
4:49+15:0:1460:65535,11:mss,sok,ts,nop,ws:df,id+,ecn:02
4:54+10:0:1460:65535,11:mss,sok,ts,nop,ws:df,id+:02
4:49+15:0:1460:65535,11:mss,sok,ts,nop,ws:df,id+:02
4:53+11:0:1460:65535,11:mss,sok,ts,nop,ws:df,id+,ecn:01
4:57+7:0:1460:65535,11:mss,sok,ts,nop,ws:df,id+:01

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (iPhone; CPU iPhone OS 18_3_0 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) CriOS/150.0.7871.113 Mobile/15E148 Safari/604.19
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0.0.0 Safari/537.368
curl/8.14.14
Mozilla/5.0 (compatible; The Lounge IRC Client; +https://github.com/thelounge/thelounge) facebookexternalhit/1.1 Twitterbot/1.02
Shadowrocket/3378 CFNetwork/3826.400.120 Darwin/24.3.0 iPhone16,12
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.108 Safari/537.361
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.361
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/143.0.0.0 Safari/537.361
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.361
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/110.0.0.0 Safari/537.361

Country

fingerprintco-occurrences
HK · Hong Kong SAR China12
US · United States6
NL · Netherlands6
CH · Switzerland3
FI · Finland3
SG · Singapore2
DE · Germany1
BG · Bulgaria1
SE · Sweden1
SV · El Salvador1

Network (ASN)

fingerprintco-occurrences
AS23961 · Misaka Network, Inc.11
AS62164 · Heymman Servers Corporation5
AS47172 · Greenhost BV4
AS216253 · Interhive OU3
AS58215 · Omniline Investment s.r.o.3
AS24940 · Hetzner Online GmbH2
AS9009 · M247 Europe SRL2
AS50360 · Tamatiya EOOD1
AS38136 · Akari Networks1
AS31786 · PloxHost1

TLS supported groups

fingerprintco-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.4
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.1
0a0a,001d,0017,00181