TCP SYN (p0f)

4:57+7:0:1460:26883,12:mss,sok,ts,nop,ws:df,id+:0

first seen 2026-09-30 13:14 · last seen 2026-10-27 12:18 · JSON

Last 7 days (1 observations)

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 TTL57+7
Options length0
MSS1460
Window size26883
Window scale12
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
t13d3113h1_e8f1e7e78f70_ce5650b735ce Match?Exact match in Thumbprint's published controlled catalog captures: php-guzzle 8.2.0, php-guzzle 8.1.0, php-guzzle 8.3.1, +4 more.The fingerprint page shows the full measured match list. More on the catalog.3

HTTP request (JA4H)

fingerprintco-occurrences
ge11nn050000_fc779ac3aeeb_000000000000_0000000000003

TCP SYN (JA4T)

fingerprintco-occurrences
26883_2-4-8-1-3_1460_123

User-Agent

fingerprintco-occurrences
Slackbot-LinkExpanding 1.0 (+https://api.slack.com/robots)3

Country

fingerprintco-occurrences
US · United States3

Network (ASN)

fingerprintco-occurrences
AS14618 · Amazon.com, Inc.3

TLS supported groups

fingerprintco-occurrences
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