TCP SYN (p0f)

4:51+13:0:1460:mss*44,0:mss,sok,ts:df,id+:0

first seen 2026-06-27 08:39 · last seen 2026-08-26 11:54 · 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 TTL51+13
Options length0
MSS1460
Window sizemss*44
Window scale0
Options layoutmss,sok,ts
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
t12i130500_2d7513195f68_e51b7354d87f35

HTTP request (JA4H)

fingerprintco-occurrences
ge11nr040000_e1d2031bdfea_000000000000_00000000000033
ge11nr040000_88d30a62b7ad_000000000000_0000000000002

TCP SYN (JA4T)

fingerprintco-occurrences
64240_2-4-8_1460_0033

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (Macintosh; Intel Mac OS X 13_1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/108.0.0.0 Safari/537.3635

Country

fingerprintco-occurrences
US · United States35

Network (ASN)

fingerprintco-occurrences
AS63949 · Akamai Connected Cloud35