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 2026-10-23 22:43 · JSON

Distinct clients per day (last 30 days, peak 30/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
t13d3013h2_1d37bd780c83_8537cf56674e32
t13i130900_f57a46bbacb6_e7c28522265120
t13d311200_e8f1e7e78f70_d339722ba4af12
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
t13d301300_1d37bd780c83_5ae85263eb3b4
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
t13d3112h1_e8f1e7e78f70_b26ce05bbdd6 Match?Exact match in Thumbprint's published controlled catalog captures: php-guzzle 8.2.0, php-guzzle 8.1.0, php-guzzle 8.0.2, +12 more.The fingerprint page shows the full measured match list. More on the catalog.2

HTTP request (JA4H)

fingerprintco-occurrences
ge11nn05zh00_4ee89fec50ea_000000000000_00000000000036
ge20nn030000_bf75ddd0bb29_000000000000_00000000000032
ge11nn05enus_813e32c09d15_000000000000_00000000000018
ge11nn06enus_3ce581af28ff_000000000000_00000000000016
ge11nn05zh00_ddc401472a00_000000000000_00000000000013
ge11nr06enus_a89d28968959_000000000000_0000000000006
ge11nn06zh00_d81147f3cea4_000000000000_0000000000004
ge11nn06zh00_e9dea1aac148_000000000000_0000000000003
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
ge20nn030000_ff50983941c1_000000000000_0000000000002

HTTP/2 frames (Akamai)

fingerprintco-occurrences
3:100;4:65536;2:0|1048510465|0|m,s,a,p Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.13.0, curl 8.18.0, curl 8.21.0, +8 more.The fingerprint page shows the full measured match list. More on the catalog.32
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 1.26.10, go-net/http 1.26.9, +8 more.The fingerprint page shows the full measured match list. More on the catalog.5
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, +57 more.The fingerprint page shows the full measured match list. More on the catalog.2

TCP SYN (JA4T)

fingerprintco-occurrences
42340_2-4-8-1-3_1460_9122

User-Agent

fingerprintco-occurrences
curl/8.14.132
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
StartmeBot/1.0 (+https://start.me/bot)16
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
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

Country

fingerprintco-occurrences
CN · China64
US · United States38
NL · Netherlands38
ID · Indonesia5
EE · Estonia2

Network (ASN)

fingerprintco-occurrences
AS4134 · CHINANET BACKBONE64
AS14061 · DigitalOcean, LLC34
AS22295 · Advin Services LLC20
AS14618 · Amazon.com, Inc.16
AS211443 · SINO WORLDWIDE TRADING LIMITED6
AS150436 · Byteplus Pte. Ltd.5
AS3249 · Telia Eesti AS2

TLS supported groups

fingerprintco-occurrences
11ec,001d,0017,001e,0018,0019,0100,0101 Match?Exact match in Thumbprint's published controlled catalog captures: node-fetch 24.22.1, python-httpx 0.28.1, python-requests 2.34.2, +2 more.The fingerprint page shows the full measured match list. More on the catalog.32