TCP SYN (p0f)

4:55+9:0:1460:65535,13:mss,sok,ts,nop,ws:df,id+:0

first seen 2026-06-11 08:10 · last seen 2026-08-25 04:13 · 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 TTL55+9
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_e381dae6da6b23
t13d1412h2_e33ad33b3d25_6b314db333b61

HTTP request (JA4H)

fingerprintco-occurrences
ge20nn080000_3b4736f856c0_000000000000_00000000000016
ge20nn090000_6c95df8859bf_000000000000_0000000000002
ge20nn070000_1c05be67a921_000000000000_0000000000002
ge20nn19enus_6d96c1a2ad8a_000000000000_0000000000002
ge20nn21enus_7551c00c2ffa_000000000000_0000000000001
ge20nn080000_eab49c6106e6_000000000000_0000000000001

HTTP/2 frames (Akamai)

fingerprintco-occurrences
2:0;3:1;4:8388608;5:65536|8323073|0|m,s,a,p24

TCP SYN (JA4T)

fingerprintco-occurrences
65535_2-4-8-1-3_1460_1323

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (compatible; GCombinator/1.0; +https://news.gcombinator.com)17
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/126.0.0.0 Safari/537.362
Mozilla/5.0 (compatible; HackerNewsAggregator/1.0)2
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/142.0.0.0 Safari/537.361
Mozilla/5.0 (compatible; PostureBot/1.0; +passive-security-check)1
Mozilla/5.0 (compatible; HNBot/1.0)1

Country

fingerprintco-occurrences
SG · Singapore19
US · United States5

Network (ASN)

fingerprintco-occurrences
AS13335 · Cloudflare, Inc.24