TCP SYN (JA4T)

65535_2-4-8-1-3_1280_9

first seen 2026-07-24 11:55 · last seen 2026-10-30 20:03 · JSON

Last 7 days (4 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 window65535
Option kinds2-4-8-1-3
MSS1280
Window scale9

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
t13d4412h1_fd39b124ee10_58ed7828516f4
t13d1515h1_8daaf6152771_de4a06bb82e33
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.2
t13d4312h1_c7886603b240_b26ce05bbdd62

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.6
ge11nn13enus_9db22d02e17a_000000000000_0000000000003
ge11nr17zhtw_021c223ca66c_000000000000_0000000000001
ge11nr18dede_45ed06ef2081_000000000000_0000000000001

TCP SYN (p0f)

fingerprintco-occurrences
4:47+17:0:1280:65535,9:mss,sok,ts,nop,ws:df,id+:02
4:46+18:0:1280:65535,9:mss,sok,ts,nop,ws:df,id+:02
4:50+14:0:1280:65535,9:mss,sok,ts,nop,ws:id-:02
4:50+14:0:1280:65535,9:mss,sok,ts,nop,ws:df,id+:01
4:42+22:0:1280:65535,9:mss,sok,ts,nop,ws:df,id+:01
4:45+19:0:1280:65535,9:mss,sok,ts,nop,ws:df,id+:01
4:44+20:0:1280:65535,9:mss,sok,ts,nop,ws:df,id+:01
4:51+13:0:1280:65535,9:mss,sok,ts,nop,ws:id-:01

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0.0.0 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/537.36 Edg/120.0.0.01
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/119.0.0.0 Safari/537.361
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/104.0.0.0 Safari/537.361
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/107.0.0.0 Safari/537.361
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/99.0.4844.51 Safari/537.361
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.1 Safari/605.1.151
Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/85.0.4183.102 Safari/537.361
Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/83.0.4103.106 Safari/537.361
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/84.0.4147.135 Safari/537.361

Country

fingerprintco-occurrences
ZA · South Africa7
IN · India3
AO · Angola1

Network (ASN)

fingerprintco-occurrences
AS37457 · Telkom SA Ltd.6
AS55836 · Reliance Jio Infocomm Limited3
AS20011 · Dimension Data1
AS37119 · UNITEL SA1

TLS supported groups

fingerprintco-occurrences
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.2
11ec,001d,0017,0018,0019 Match?Exact match in Thumbprint's published controlled catalog captures: firefox 157.0.1, firefox-esr 153.5.1esr, firefox 158.0.1, +3 more.The fingerprint page shows the full measured match list. More on the catalog.2