TCP SYN (p0f)

4:44+20:0:1460:mss*44,8:mss,sok,ts,nop,ws:df,id+:0

first seen 2026-07-01 14:34 · last seen 2026-08-18 07:32 · 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 TTL44+20
Options length0
MSS1460
Window sizemss*44
Window scale8
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
t12d1609h2_8cdfa2d4673b_f9c1bad5661c1
t13d191000_9dc949149365_e7c2852226511
t13d1511h2_8daaf6152771_b11bb3600f941

HTTP request (JA4H)

fingerprintco-occurrences
ge11nn040000_8391bea91fb6_000000000000_0000000000001
he20nn010000_a510e5066512_000000000000_0000000000001
ge20nn04enus_989c7cc05c9b_000000000000_0000000000001

HTTP/2 frames (Akamai)

fingerprintco-occurrences
2:0;4:4194304;6:8192|1073741824|0|a,m,p,s1
1:65536;2:0;4:6291456;6:262144;4:1048576|15663105|1:0:0:256|m,a,s,p1

TCP SYN (JA4T)

fingerprintco-occurrences
64240_2-4-8-1-3_1460_83

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.67 Safari/537.361
Go-http-client/1.11
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/135.0.0.8 Safari/537.361

Country

fingerprintco-occurrences
FR · France2
FI · Finland1

Network (ASN)

fingerprintco-occurrences
AS16276 · OVH SAS2
AS200651 · FlokiNET ehf1