TCP SYN (p0f)

4:45+19:0:1410:mss*46,9:mss,sok,ts,nop,ws:df,id+:0

first seen 2026-10-31 13:22 · last seen 2026-10-31 13:22 · JSON

Last 7 days (1 observations)

Decomposed attributes

IP version4
Initial TTL45+19
Options length0
MSS1410
Window sizemss*46
Window scale9
Options layoutmss,sok,ts,nop,ws
Quirksdf,id+
Payload class0

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
t13d1011h2_61a7ad8aa9b6_3a8073edd8ef1

HTTP request (JA4H)

fingerprintco-occurrences
ge20nn030000_80b089f68b8e_000000000000_0000000000001

HTTP/2 frames (Akamai)

fingerprintco-occurrences
2:0;4:2097152;5:16384;6:16384|5177345|0|m,s,a,p Match?Exact match in Thumbprint's published controlled catalog captures: rust-reqwest 0.12.28, rust-reqwest 0.13.5, rust-reqwest 0.13.4, +4 more.The fingerprint page shows the full measured match list. More on the catalog.1

TCP SYN (JA4T)

fingerprintco-occurrences
64860_2-4-8-1-3_1410_91

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (compatible; cyber-asset-fetch/1)1

Country

fingerprintco-occurrences
CN · China1

Network (ASN)

fingerprintco-occurrences
AS4837 · CHINA UNICOM China169 Backbone1

TLS supported groups

fingerprintco-occurrences
001d,0017,0018 Match?Exact match in Thumbprint's published controlled catalog captures: rust-reqwest 0.12.28, rust-reqwest 0.11.27, powershell 7.6.8, +1 more.The fingerprint page shows the full measured match list. More on the catalog.1