TCP SYN (JA4T)

65280_2-1-3-1-1-4_1360_8

first seen 2026-07-01 16:10 · last seen 2026-10-25 21:43 · JSON

Last 7 days (2 observations)

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 window65280
Option kinds2-1-3-1-1-4
MSS1360
Window scale8

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
t13d1514h2_8daaf6152771_7bdcd1fc0afb9
t13d1812h1_85036bcba153_d41ae481755e6
t12d860600_e18388e7f3a3_a1e9356827954
t13d4312h1_c7886603b240_b26ce05bbdd64
t13d181100_85036bcba153_d41ae481755e3
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.1
t13d4312h1_c7886603b240_8d633dac71241
t13d1313h2_f57a46bbacb6_9249cab70c771
t13d2913h1_723694b0fccc_5671b5df50291

HTTP request (JA4H)

fingerprintco-occurrences
ge20nr11enus_3901d4197baf_000000000000_0000000000006
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
ge11nn06enus_ff6fe191b79d_000000000000_0000000000003
ge20nr10enus_d353d425b0bb_000000000000_0000000000003
ge11nn040000_e1d2031bdfea_000000000000_0000000000002
po11nn070000_c3be8024b1dd_000000000000_0000000000002
ge11nn07enus_457a0325d13c_000000000000_0000000000002
ge11cn040000_e1d2031bdfea_b04fd684bb87_349cc859444c2
ge20nr020000_fb4f949fd323_000000000000_0000000000001
po11nn060000_a35477c4bdb5_000000000000_0000000000001

HTTP/2 frames (Akamai)

fingerprintco-occurrences
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.4
1:65536;2:0;4:131072;5:16384|12517377|9:0:0:42|m,p,a,s2
1:65536;2:0;3:1000;4:6291456;6:262144|15663105|1:1:0:256|m,a,s,p1
1:65536;2:0;4:131072;5:16384|12517377|11:0:0:42|m,p,a,s1
1:65536;2:0;4:131072;5:16384|12517377|7:0:0:42|m,p,a,s1
1:65536;2:0;4:131072;5:16384|12517377|5:0:0:42|m,p,a,s1

TCP SYN (p0f)

fingerprintco-occurrences
4:111+17:0:1360:mss*48,8:mss,nop,ws,nop,nop,sok:df,id+,ecn:06
4:115+13:0:1360:mss*48,8:mss,nop,ws,nop,nop,sok:df,id+:05
4:114+14:0:1360:mss*48,8:mss,nop,ws,nop,nop,sok:df,id+:05
4:114+14:0:1360:mss*48,8:mss,nop,ws,nop,nop,sok:df,id+,ecn:04
4:119+9:0:1360:mss*48,8:mss,nop,ws,nop,nop,sok:df,id+,ecn:03
4:116+12:0:1360:mss*48,8:mss,nop,ws,nop,nop,sok:df,id+,ecn:02
4:110+18:0:1360:mss*48,8:mss,nop,ws,nop,nop,sok:df,id+,ecn:02
4:112+16:0:1360:mss*48,8:mss,nop,ws,nop,nop,sok:df,id+,ecn:01
4:120+8:0:1360:mss*48,8:mss,nop,ws,nop,nop,sok:df,id+,ecn:01
4:112+16:0:1360:mss*48,8:mss,nop,ws,nop,nop,sok:df,id+:01

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:156.0) Gecko/20100101 Firefox/156.09
Mozilla/5.0 compatible; FastSourceScanner/1.05
python-requests/2.28.14
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/88.0.4240.193 Safari/537.362
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 (Windows NT 10.0; Win64; x64) WormGPT/4.11
Mozilla/5.0 (Macintosh; Intel Mac OS X 13.3; rv:113.0) Gecko/20100101 Firefox/113.01
Mozilla/5.0 (Macintosh; Intel Mac OS X 11.0; rv:92.0) Gecko/20100101 Firefox/92.01
Mozilla/5.0 (Windows NT 5.1; rv:9.0.1) Gecko/20100101 Firefox/9.0.11
wp2shell1

Country

fingerprintco-occurrences
NL · Netherlands10
DE · Germany7
ID · Indonesia3
SI · Slovenia3
RU · Russia2
ES · Spain2
US · United States1
KR · South Korea1
GB · United Kingdom1

Network (ASN)

fingerprintco-occurrences
AS213790 · Limited Network LTD7
AS59796 · StormWall s.r.o.7
AS60781 · LeaseWeb Netherlands B.V.4
AS58477 · Argon Data Communication3
AS197769 · VPS Dedicated LLC3
AS3352 · TELEFONICA DE ESPANA S.A.U.2
AS43298 · Storm Networks LLC2
AS20115 · Charter Communications LLC1
AS4766 · Korea Telecom1

TLS supported groups

fingerprintco-occurrences
001d,0017,001e,0019,00181
6399,001d,0017,0018,00191
0017,0019,001c,001b,0018,001a,0016,000e,000d,000b,000c,0009,000a1