TCP SYN (p0f)

4:45+19:0:1460:mss*44,11:mss,sok,ts,nop,ws:df,id+:0

first seen 2026-07-15 20:58 · last seen 2026-09-03 19:01 · 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

IP version4
Initial TTL45+19
Options length0
MSS1460
Window sizemss*44
Window scale11
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
t13d311000_8ae6a2f5ac15_5ac7197df9d22
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

HTTP request (JA4H)

fingerprintco-occurrences
ge11nn050000_be0d0b335e46_000000000000_0000000000002
ge11nn040000_e1d2031bdfea_000000000000_0000000000002

TCP SYN (JA4T)

fingerprintco-occurrences
64240_2-4-8-1-3_1460_114

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (compatible; SemrushBot/7~bl; +http://www.semrush.com/bot.html)2
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 Chrome/125 Safari/537.362

Country

fingerprintco-occurrences
US · United States2
CH · Switzerland2

Network (ASN)

fingerprintco-occurrences
AS209366 · SEMrush CY LTD2
AS51852 · Private Layer INC2