TCP SYN (p0f)

4:111+17:0:1440:mss*44,8:mss,nop,ws,nop,nop,sok:df,id+,ecn:0

first seen 2026-06-27 14:01 · last seen 2026-08-22 00:00 · 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 TTL111+17
Options length0
MSS1440
Window sizemss*44
Window scale8
Options layoutmss,nop,ws,nop,nop,sok
Quirksdf,id+,ecn
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
t13d2212h2_231e334592e8_36bf25f296df4

HTTP request (JA4H)

fingerprintco-occurrences
ge20nn050000_31926751f3ec_000000000000_0000000000001
ge20nn040000_2b87c4285863_000000000000_0000000000001
ge20nn040000_ac162d8a7b0c_000000000000_0000000000001
ge20nn040000_31537f9be9e0_000000000000_0000000000001

HTTP/2 frames (Akamai)

fingerprintco-occurrences
2:0;4:65535|67043329|0|m,s,a,p4

TCP SYN (JA4T)

fingerprintco-occurrences
64240_2-1-3-1-1-4_1440_83

User-Agent

fingerprintco-occurrences
Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; bingbot/2.0; +http://www.bing.com/bingbot.htm) Chrome/116.0.1938.76 Safari/537.364

Country

fingerprintco-occurrences
US · United States4

Network (ASN)

fingerprintco-occurrences
AS8075 · Microsoft Corporation4