TCP SYN (p0f)

4:53+11:0:1424:mss*44,7:mss,sok,ts,nop,ws:df,id+:0

first seen 2026-10-21 12:25 · last seen 2026-10-21 13:33 · 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 TTL53+11
Options length0
MSS1424
Window sizemss*44
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
t13d2014h2_a09f3c656075_e42f34c56612 Match?Exact match in Thumbprint's published controlled catalog captures: safari 26.5.2, safari 26.5, safari 26.6.1, +1 more.The fingerprint page shows the full measured match list. More on the catalog.8
t13d1713h1_5b57614c22b0_eca864cca44a1

HTTP request (JA4H)

fingerprintco-occurrences
ge20nn08zhcn_1945e0741196_000000000000_0000000000003
ge20nr09zhcn_538441e4e116_000000000000_0000000000002
ge20nr09zhcn_935a4c186404_000000000000_0000000000002
ge11nn050000_b87164279ccf_000000000000_0000000000001
ge20nn09zhcn_547aba124fbf_000000000000_0000000000001

HTTP/2 frames (Akamai)

fingerprintco-occurrences
2:0;3:100;4:2097152;9:1|10420225|1:0:0:256|m,s,a,p Match?Exact match in Thumbprint's published controlled catalog captures: safari 26.5.2.The fingerprint page shows the full measured match list. More on the catalog.5
2:0;3:100;4:2097152;9:1|10420225|0|m,s,a,p Match?Exact match in Thumbprint's published controlled catalog captures: safari 26.5.2, safari 26.6.2, safari 26.5, +2 more.The fingerprint page shows the full measured match list. More on the catalog.2
2:0;3:100;4:2097152;9:1|10420225|3:0:0:256|m,s,a,p1

TCP SYN (JA4T)

fingerprintco-occurrences
64240_2-4-8-1-3_1424_79

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (iPhone; CPU iPhone OS 18_7 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/18.7.5 Mobile/15E148 Safari/604.18
Mozilla/5.01

Country

fingerprintco-occurrences
HK · Hong Kong SAR China9

Network (ASN)

fingerprintco-occurrences
AS132203 · Tencent Building, Kejizhongyi Avenue9

TLS supported groups

fingerprintco-occurrences
0a0a,001d,0017,0018,00198
001d,0017,0018 Match?Exact match in Thumbprint's published controlled catalog captures: rust-reqwest 0.12.28, rust-reqwest 0.11.27, powershell 7.6.8, +1 more.The fingerprint page shows the full measured match list. More on the catalog.1