TCP SYN (p0f)

4:55+9:0:1380:mss*47,7:mss,sok,ts,nop,ws:df,id+:0

first seen 2026-07-05 07:23 · last seen 2026-08-12 09:42 · JSON

Decomposed attributes

IP version4
Initial TTL55+9
Options length0
MSS1380
Window sizemss*47
Window scale7
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
t13d1516h2_8daaf6152771_e5627efa2ab15
t13d1713h1_ab0a1bf427ad_ecd0401ec68b Match?Exact match in Thumbprint's published controlled catalog captures: python-httpx 0.28.1.The fingerprint page shows the full measured match list. More on the catalog.2
t13d101000_61a7ad8aa9b6_f9531d9725131

HTTP request (JA4H)

fingerprintco-occurrences
ge20nr07enus_3a51d8071d5f_000000000000_0000000000004
ge11nn06enus_7eb5f6c8ec48_000000000000_0000000000002
ge20nn09enus_a545420ec371_000000000000_0000000000001
ge11nn06enus_c20ff315eaaf_000000000000_0000000000001

HTTP/2 frames (Akamai)

fingerprintco-occurrences
1:65536;3:1000;4:6291456;6:262144|15663105|1:1:0:256|m,a,s,p1
1:65536;3:1000;4:6291456;6:262144|15663105|9:1:0:220|m,a,s,p1
1:65536;3:1000;4:6291456;6:262144|15663105|11:1:9:220|m,a,s,p1
1:65536;3:1000;4:6291456;6:262144|15663105|13:1:0:220|m,a,s,p1
1:65536;3:1000;4:6291456;6:262144|15663105|15:1:0:220|m,a,s,p1

TCP SYN (JA4T)

fingerprintco-occurrences
64860_2-4-8-1-3_1380_78

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/121.0.4942.274 Safari/537.365
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0 Safari/537.363

Country

fingerprintco-occurrences
US · United States5
GB · United Kingdom2
NL · Netherlands1

Network (ASN)

fingerprintco-occurrences
AS40663 · IncogNet LLC5
AS42831 · UK Dedicated Servers Limited2
AS174 · Cogent Communications, LLC1