TCP SYN (JA4T)

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

first seen 2026-07-01 16:10 · last seen 2026-08-27 03:07 · 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 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
t13d4312h1_c7886603b240_b26ce05bbdd64
t13d181100_85036bcba153_d41ae481755e3
t13d1812h1_85036bcba153_d41ae481755e3
t12d860600_e18388e7f3a3_a1e9356827951
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
t13d2913h1_723694b0fccc_5671b5df50291

HTTP request (JA4H)

fingerprintco-occurrences
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
ge11nn07enus_457a0325d13c_000000000000_0000000000002
po11nn070000_c3be8024b1dd_000000000000_0000000000002
ge11cn040000_e1d2031bdfea_b04fd684bb87_349cc859444c2
ge11nn05enus_dff23709e538_000000000000_0000000000001
po11nn060000_a35477c4bdb5_000000000000_0000000000001
po11nn060000_d8e0803a0d25_000000000000_0000000000001
ge11nn06enus_ac0ce46833c4_000000000000_0000000000001
ge11nr11kokr_835281d8e5d9_000000000000_0000000000001

TCP SYN (p0f)

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

User-Agent

fingerprintco-occurrences
python-requests/2.28.14
Mozilla/5.0 compatible; FastSourceScanner/1.02
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
python-requests/2.25.11
Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:122.0) Gecko/20100101 Firefox/122.01
Mozilla/5.0 (iPhone; CPU iPhone OS 17_4 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) FxiOS/153.0 Mobile/15E148 Safari/604.11

Country

fingerprintco-occurrences
NL · Netherlands8
ID · Indonesia3
ES · Spain2
KR · South Korea1

Network (ASN)

fingerprintco-occurrences
AS213790 · Limited Network LTD4
AS60781 · LeaseWeb Netherlands B.V.4
AS58477 · Argon Data Communication3
AS3352 · TELEFONICA DE ESPANA S.A.U.2
AS4766 · Korea Telecom1