TCP SYN (p0f)

4:49+15:0:1460:mss*29,9:mss,sok,ts,nop,ws:df,id+:0

first seen 2026-06-11 12:43 · last seen 2026-09-07 05:34 · JSON

Distinct clients per day (last 30 days, peak 2/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 TTL49+15
Options length0
MSS1460
Window sizemss*29
Window scale9
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
t13d191000_9dc949149365_e7c28522265164
t13i130900_f57a46bbacb6_e7c28522265120
t13d311200_e8f1e7e78f70_d339722ba4af10
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.6
t13d1912h2_9dc949149365_e5728521abd45
t13d3112h1_e8f1e7e78f70_b26ce05bbdd6 Match?Exact match in Thumbprint's published controlled catalog captures: php-guzzle 8.1.0, php-guzzle 8.0.2, php-guzzle 7.14.2, +6 more.The fingerprint page shows the full measured match list. More on the catalog.2

HTTP request (JA4H)

fingerprintco-occurrences
ge11nn05zh00_4ee89fec50ea_000000000000_00000000000036
ge11nn05enus_813e32c09d15_000000000000_00000000000018
ge11nn05zh00_ddc401472a00_000000000000_00000000000013
ge11nn06enus_3ce581af28ff_000000000000_00000000000010
ge11nr06enus_a89d28968959_000000000000_0000000000006
ge11nn06zh00_d81147f3cea4_000000000000_0000000000004
ge11nn06zh00_e9dea1aac148_000000000000_0000000000003
ge20nn030000_ff50983941c1_000000000000_0000000000002
ge11nn040000_88d30a62b7ad_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: wget 1.25.0.The fingerprint page shows the full measured match list. More on the catalog.2
ge11nn06enus_fb4afd1f380a_000000000000_0000000000002

HTTP/2 frames (Akamai)

fingerprintco-occurrences
2:0;4:4194304;5:16384;6:10485760|1073741824|0|a,m,p,s Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.26.6, go-net/http 1.26.8, go-net/http 1.26.7, +6 more.The fingerprint page shows the full measured match list. More on the catalog.5

TCP SYN (JA4T)

fingerprintco-occurrences
42340_2-4-8-1-3_1460_982

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (Linux; Android 11; vivo 1906; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/87.0.4280.141 Mobile Safari/537.36 VivoBrowser/8.9.0.030
curl/7.4.015
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/85.0.4183.121 Safari/537.3613
StartmeBot/1.0 (+https://start.me/bot)10
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/121.0.0.0 Safari/537.366
Mozilla/5.0 (compatible; pathscan/1.0)5
okhttp/3.14.95
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/147.0.0.0 Safari/537.362
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/122.0.0.0 Safari/537.362
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/147.0.0.0 Safari/537.36 Edg/147.0.0.02

Country

fingerprintco-occurrences
CN · China64
US · United States32
NL · Netherlands6
ID · Indonesia5

Network (ASN)

fingerprintco-occurrences
AS4134 · CHINANET BACKBONE64
AS22295 · Advin Services LLC20
AS14618 · Amazon.com, Inc.10
AS211443 · SINO WORLDWIDE TRADING LIMITED6
AS150436 · Byteplus Pte. Ltd.5
AS14061 · DigitalOcean, LLC2