TCP SYN (p0f)

4:55+9:0:1460:mss*29,12:mss,sok,ts,nop,ws:df,id+:0

first seen 2026-07-01 23:24 · last seen 2026-09-01 04:21 · 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 TTL55+9
Options length0
MSS1460
Window sizemss*29
Window scale12
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.2
t13d1313h2_f57a46bbacb6_7f0f34a4126d1

HTTP request (JA4H)

fingerprintco-occurrences
ge20nn08enus_6452f234bcf7_000000000000_0000000000001
ge11nr040000_e1d2031bdfea_000000000000_0000000000001
ge11nr030000_cd680697de12_000000000000_0000000000001

HTTP/2 frames (Akamai)

fingerprintco-occurrences
2:0;4:2097152;3:100;9:1|10485760|0|m,s,p,a1

TCP SYN (JA4T)

fingerprintco-occurrences
42340_2-4-8-1-3_1460_123

User-Agent

fingerprintco-occurrences
Mozilla/5.01
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.361
Mozilla/5.0 (compatible; RedditApp/1.0)1

Country

fingerprintco-occurrences
US · United States3

Network (ASN)

fingerprintco-occurrences
AS150303 · SoloRDP2
AS62240 · Clouvider1