TCP SYN (p0f)

4:45+19:0:1368:64860,9:mss,sok,ts,nop,ws:df,id+:0

first seen 2026-07-24 16:42 · last seen 2026-08-20 07:41 · 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
MSS1368
Window size64860
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
t13d1712h2_5b57614c22b0_ef7df7f74e483
t13d1712h2_5b57614c22b0_d5fe2c511efa1
t13d1713h2_5b57614c22b0_02c8e53ee3981

HTTP request (JA4H)

fingerprintco-occurrences
ge20nn060000_ae91ff777030_000000000000_0000000000005

HTTP/2 frames (Akamai)

fingerprintco-occurrences
2:0;1:4096;8:0;3:1024;4:1048576|25100289|0|a,p,m,s5

TCP SYN (JA4T)

fingerprintco-occurrences
64860_2-4-8-1-3_1368_95

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36; compatible; OAI-SearchBot/1.0; +https://openai.com/searchbot5

Country

fingerprintco-occurrences
US · United States5

Network (ASN)

fingerprintco-occurrences
AS8075 · Microsoft Corporation5