TCP SYN (p0f)

4:48+16:0:1460:mss*29,9:mss,sok,ts,nop,ws:df,id+:0

first seen 2026-07-13 23:38 · last seen 2026-10-23 22:44 · JSON

Distinct clients per day (last 30 days, peak 42/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 TTL48+16
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
t13d3013h2_1d37bd780c83_8537cf56674e42
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.2
t13d311200_e8f1e7e78f70_d339722ba4af2
t13d4312h1_c7886603b240_b26ce05bbdd61
t13d1411h2_15c1305fa4d5_b11bb3600f941
t13d1311h2_f4ad024020fe_9ced094328c91

HTTP request (JA4H)

fingerprintco-occurrences
ge20nn030000_bf75ddd0bb29_000000000000_00000000000042
ge11nn06enus_3ce581af28ff_000000000000_0000000000002
ge20nn04enus_989c7cc05c9b_000000000000_0000000000002
ge11nr06enus_a89d28968959_000000000000_0000000000001
ge11nn050000_b223a0ebb0b5_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: python-requests 2.34.2, python-requests 2.33.1, python-requests 2.32.3.The fingerprint page shows the full measured match list. More on the catalog.1
ge11nr05enus_f3bb7aa45ec4_000000000000_0000000000001

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.42
1:65536;2:0;4:6291456;6:262144;4:1048576|15663105|1:0:0:256|m,a,s,p2

TCP SYN (JA4T)

fingerprintco-occurrences
42340_2-4-8-1-3_1460_949

User-Agent

fingerprintco-occurrences
curl/8.14.142
StartmeBot/1.0 (+https://start.me/bot)2
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/121.0.0.0 Safari/537.362
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/146.0.0.0 Safari/537.361
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/132.0.0.7 Safari/537.361
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/127.0.0.9 Safari/537.361

Country

fingerprintco-occurrences
GB · United Kingdom41
NL · Netherlands4
US · United States2
DE · Germany1
ES · Spain1

Network (ASN)

fingerprintco-occurrences
AS14061 · DigitalOcean, LLC41
AS211443 · SINO WORLDWIDE TRADING LIMITED2
AS14618 · Amazon.com, Inc.2
AS61125 · SABOTAGE LLC2
AS24961 · WIIT AG1
AS15704 · XTRA TELECOM S.A.1

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.42
001d,0017,001e,0019,0018,0100,0101,0102,0103,0104 Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.13.0, php-guzzle 8.3.1, curl 7.88.1, +10 more.The fingerprint page shows the full measured match list. More on the catalog.1