TCP SYN (p0f)

4:51+13:0:1460:mss*29,11:mss,sok,ts,nop,ws:df,id+:0

first seen 2026-06-11 02:55 · last seen 2026-08-18 06:38 · JSON

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 TTL51+13
Options length0
MSS1460
Window sizemss*29
Window scale11
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_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
t13d1715h1_5b57614c22b0_e8ed158c4d851
t13d0910h2_e2380049d7f0_5603904660151
t13d1010h2_8229f2f4f982_5603904660151
t13d1311h2_b4fef3eafbaf_9ced094328c91
t13d1111h2_53dc32bbcc7c_9ced094328c91
t13d1210h2_32fd516342e2_5603904660151

HTTP request (JA4H)

fingerprintco-occurrences
ge20nn04enus_989c7cc05c9b_000000000000_0000000000005
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
ge11nn050000_8a08de6f3d0a_000000000000_0000000000001

HTTP/2 frames (Akamai)

fingerprintco-occurrences
1:65536;2:0;4:6291456;6:262144;4:1048576|15663105|1:0:0:256|m,a,s,p5

TCP SYN (JA4T)

fingerprintco-occurrences
42340_2-4-8-1-3_1460_116

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.361
Mozilla/5.0 (compatible; CT-WP-Scanner/1.0; +https://example.com/bot)1
Claude-User (claude-code/2.1.119; +https://support.anthropic.com/)1
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/135.0.0.3 Safari/537.36 Edg/135.0.0.31
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/135.0.0.3 Safari/537.361
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/135.0.0.1 Safari/537.361
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.3 Safari/537.361
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/18.3.9 Safari/605.1.151

Country

fingerprintco-occurrences
NL · Netherlands6
US · United States1
RO · Romania1

Network (ASN)

fingerprintco-occurrences
AS60404 · Liteserver5
AS197170 · TechTies Inc.1
AS47890 · UNMANAGED LTD1
AS138997 · Eons Data Communications Limited1