TCP SYN (p0f)

4:54+10:0:1380:mss*47,7:mss,sok,ts,nop,ws:df,id+:0

first seen 2026-07-02 00:16 · last seen 2026-08-29 09:24 · 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 TTL54+10
Options length0
MSS1380
Window sizemss*47
Window scale7
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
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.3
t13d5212h1_b262b3658495_8e6e362c5eac Match?Exact match in Thumbprint's published controlled catalog captures: node-fetch 24.19.0, node-fetch 22.23.1, node-fetch 24.21.0, +6 more.The fingerprint page shows the full measured match list. More on the catalog.2
t13d1713h1_ab0a1bf427ad_ecd0401ec68b Match?Exact match in Thumbprint's published controlled catalog captures: python-httpx 0.28.1.The fingerprint page shows the full measured match list. More on the catalog.1

HTTP request (JA4H)

fingerprintco-occurrences
ge11nn05enus_f3bb7aa45ec4_000000000000_0000000000003
ge11nn07en00_131b6413da1e_000000000000_0000000000001
ge11nn07*000_131b6413da1e_000000000000_0000000000001
ge11nn06enus_7eb5f6c8ec48_000000000000_0000000000001

TCP SYN (JA4T)

fingerprintco-occurrences
64860_2-4-8-1-3_1380_76

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0.0.0 Safari/537.363
Mozilla/5.0 (compatible; NuxtFyi/0.1; +https://nuxt.fyi)2
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0 Safari/537.361

Country

fingerprintco-occurrences
US · United States4
GB · United Kingdom2

Network (ASN)

fingerprintco-occurrences
AS62651 · Strong Technology, LLC.4
AS30081 · CacheFly2