TCP SYN (p0f)

4:107+21:0:1440:mss*44,0:mss,nop,nop,sok:df,id+,ecn:0

first seen 2026-08-28 00:14 · last seen 2026-09-05 10:40 · 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 TTL107+21
Options length0
MSS1440
Window sizemss*44
Window scale0
Options layoutmss,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
t13d2013h2_2b729b4bf6f3_e24568c0d4402

HTTP request (JA4H)

fingerprintco-occurrences
ge20nn060000_0c07ec02b430_000000000000_0000000000002

HTTP/2 frames (Akamai)

fingerprintco-occurrences
2:0;4:10485760|10420225|0|m,p,a,s2

TCP SYN (JA4T)

fingerprintco-occurrences
64240_2-1-1-4_1440_002

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/537.362

Country

fingerprintco-occurrences
US · United States2

Network (ASN)

fingerprintco-occurrences
AS8075 · Microsoft Corporation2