TCP SYN (p0f)

4:51+13:0:1460:65535,13:mss,sok,ts,nop,ws:df,id+:0

first seen 2026-07-01 14:32 · last seen 2026-09-09 13:36 · JSON

Distinct clients per day (last 30 days, peak 2/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 size65535
Window scale13
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
t13d1312h2_a44d0ee8b3cc_e381dae6da6b10

HTTP request (JA4H)

fingerprintco-occurrences
ge20nn080000_3b4736f856c0_000000000000_0000000000003
ge20nn090000_6c95df8859bf_000000000000_0000000000003
ge20nn18enus_f19a7ce03b58_000000000000_0000000000002
ge20nr19enus_6d96c1a2ad8a_000000000000_0000000000001
ge20nr11enus_47e60bf2d4c9_000000000000_0000000000001

HTTP/2 frames (Akamai)

fingerprintco-occurrences
2:0;3:1;4:8388608;5:65536|8323073|0|m,s,a,p10

TCP SYN (JA4T)

fingerprintco-occurrences
65535_2-4-8-1-3_1460_1310

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (compatible; GCombinator/1.0; +https://news.gcombinator.com)3
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/125.0.0.0 Safari/537.362
Mozilla/5.0 (compatible; bot/1.0)2
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/135.0.0.0 Safari/537.361
Mozilla/5.0 (compatible; HNBot/1.0)1
Mozilla/5.0 (Macintosh; Intel Mac OS X 14_5) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/18.4 Safari/605.1.151

Country

fingerprintco-occurrences
SG · Singapore4
FR · France4
AU · Australia1
NL · Netherlands1

Network (ASN)

fingerprintco-occurrences
AS13335 · Cloudflare, Inc.10