TCP SYN (p0f)

4:55+9:0:1460:mss*15,10:mss,sok,ts,nop,ws:df,id+:0

first seen 2026-10-13 18:16 · last seen 2026-10-30 01:33 · JSON

Last 7 days (1 observations)

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*15
Window scale10
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
t13d190900_9dc949149365_97f8aa674fd92

HTTP request (JA4H)

fingerprintco-occurrences
ge11nn040000_e1d2031bdfea_000000000000_0000000000002

TCP SYN (JA4T)

fingerprintco-occurrences
21900_2-4-8-1-3_1460_102

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (compatible; CensysInspect/1.1; +https://about.censys.io/)2

Country

fingerprintco-occurrences
US · United States2

Network (ASN)

fingerprintco-occurrences
AS398324 · Censys, Inc.2

TLS supported groups

fingerprintco-occurrences
11ec,11ed,11eb,0202,001d,0017,0018,00191