TCP SYN (JA4T)

65535_2-1-3_1420_12

first seen 2026-07-23 00:36 · last seen 2026-10-22 18:20 · 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 window65535
Option kinds2-1-3
MSS1420
Window scale12

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
t13i1909h1_9dc949149365_97f8aa674fd913

HTTP request (JA4H)

fingerprintco-occurrences
ge11nr040000_e1d2031bdfea_000000000000_00000000000013

TCP SYN (p0f)

fingerprintco-occurrences
4:58+6:0:1420:65535,12:mss,nop,ws:df,id+:013

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (compatible; GenomeCrawlerd/1.0; +https://www.nokia.com/genomecrawler)13

Country

fingerprintco-occurrences
US · United States13

Network (ASN)

fingerprintco-occurrences
AS396982 · Google LLC13

TLS supported groups

fingerprintco-occurrences
001d,0017,0018,0019 Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.21.13.The fingerprint page shows the full measured match list. More on the catalog.1