TCP SYN (p0f)

4:57+7:0:1460:65535,6:mss,nop,ws,sok,ts:df,id+:0

first seen 2026-08-03 13:33 · last seen 2026-08-26 06:58 · 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 TTL57+7
Options length0
MSS1460
Window size65535
Window scale6
Options layoutmss,nop,ws,sok,ts
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
t13d260900_6d1bcf7a4624_188c7f576dcd31

HTTP request (JA4H)

fingerprintco-occurrences
ge11nr13enus_695efbec79f4_000000000000_00000000000013
ge11nr14enus_3db8af7c5dd9_000000000000_0000000000004
ge11nn14enus_d644675fec09_000000000000_0000000000004
ge11nr14enus_d9d4fb46dcb1_000000000000_0000000000003
ge11nn15enus_d29420ce31fc_000000000000_0000000000002
ge11nr15enus_d29420ce31fc_000000000000_0000000000001
ge11nr15enus_c4fdbb0e9d8a_000000000000_0000000000001
ge11nn14enus_d9d4fb46dcb1_000000000000_0000000000001
ge11nr14enus_d644675fec09_000000000000_0000000000001
ge11nr15enus_cb03e2138c2f_000000000000_0000000000001

TCP SYN (JA4T)

fingerprintco-occurrences
65535_2-1-3-4-8_1460_631

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/151.0.0.0 Safari/537.3615
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/151.0.0.0 Safari/537.36 Edg/151.0.0.08
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/151.0.0.0 Safari/537.36 Edg/151.0.0.08

Country

fingerprintco-occurrences
AT · Austria20
NL · Netherlands8
PL · Poland3

Network (ASN)

fingerprintco-occurrences
AS62044 · Zscaler Switzerland GmbH31