TCP SYN (p0f)

4:50+14:0:1424:mss*20,7:mss,sok,ts,nop,ws:df,id+:0

first seen 2026-06-25 09:53 · last seen 2026-09-15 21:48 · JSON

Last 7 days (225 observations)

Distinct clients per day (last 30 days, peak 46/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 TTL50+14
Options length0
MSS1424
Window sizemss*20
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
t13d131100_f57a46bbacb6_e5728521abd41348
t13d131000_f57a46bbacb6_e7c285222651 Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.23.12.The fingerprint page shows the full measured match list. More on the catalog.443
t13d190900_9dc949149365_97f8aa674fd9104
t13d311000_e8f1e7e78f70_5ac7197df9d22
t13d1516h2_8daaf6152771_d8a2da3f94cd Match?Exact match in Thumbprint's published controlled catalog captures: chromium 149.0.7827.102, chrome 149.0.7827.102, chrome 149.0.7827.156, +25 more.The fingerprint page shows the full measured match list. More on the catalog.2
t13d131100_f57a46bbacb6_ab7e3b40a677 Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.26.6, go-net/http 1.26.5, go-net/http 1.26.4.The fingerprint page shows the full measured match list. More on the catalog.1

HTTP request (JA4H)

fingerprintco-occurrences
ge11nn10zhcn_9c0cf7475f83_000000000000_0000000000001426
ge11nr10zhcn_9c0cf7475f83_000000000000_000000000000419
ge11nn10zhcn_986c3fb09fa9_000000000000_00000000000041
ge11nr10zhcn_986c3fb09fa9_000000000000_0000000000009
ge11nn05zhcn_65b616753dd4_000000000000_0000000000002
ge20nn15enus_a80081d13d36_000000000000_0000000000002
ge11nr030000_cd680697de12_000000000000_0000000000001

HTTP/2 frames (Akamai)

fingerprintco-occurrences
1:65536;2:0;4:6291456;6:262144|15663105|1:1:0:256|m,a,s,p Match?Exact match in Thumbprint's published controlled catalog captures: chromium 131.0.6778.33, chromium 151.0.7922.34, chrome 151.0.7922.137, +42 more.The fingerprint page shows the full measured match list. More on the catalog.2

TCP SYN (JA4T)

fingerprintco-occurrences
29200_2-4-8-1-3_1424_71844

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (iPhone; CPU iPhone OS 13_2_3 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/13.0.3 Mobile/15E148 Safari/604.11895
Sogou web spider/4.0(+http://www.sogou.com/docs/help/webmasters.htm#07)4
Go-http-client/1.11

Country

fingerprintco-occurrences
US · United States1203
DE · Germany428
JP · Japan221
SG · Singapore26
CN · China12
KR · South Korea9
HK · Hong Kong SAR China1

Network (ASN)

fingerprintco-occurrences
AS132203 · Tencent Building, Kejizhongyi Avenue1888
AS45090 · Shenzhen Tencent Computer Systems Company Limited8
AS134756 · CHINANET Nanjing Jishan IDC network4