TCP SYN (p0f)

4:58+6:0:1460:62727,10:mss,sok,ts,nop,ws:df,id+:0

first seen 2026-06-30 01:44 · last seen 2026-09-03 18:21 · 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 TTL58+6
Options length0
MSS1460
Window size62727
Window scale10
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
t13d1517h2_8daaf6152771_dcad5a0539917
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
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.4
t13d131100_f57a46bbacb6_e5728521abd43

HTTP request (JA4H)

fingerprintco-occurrences
ge20nr09enus_755f4c16f575_000000000000_0000000000004
ge20cn13enus_5c23bbaf48b1_e9b37928e2d3_cf1e273095552
ge11cn14enus_a86c1525b786_0cfaf7fb53a8_89d6b5cf7c211
ge11cn14enus_a86c1525b786_85fbb6ec67d9_122b02017d9c1
ge11cn14enus_a86c1525b786_98d36206191d_ac08ecd7e83b1
ge11cn14enus_a86c1525b786_c579b4ac3ac9_92c8cdca403d1
ge11cn14enus_a86c1525b786_3aadd19ee40d_3b91cc6c36461
ge11cn14enus_a86c1525b786_325a8bf3ea03_b95a7e2910971
ge11cn14enus_a86c1525b786_e2c1a93c6d37_378ae6db18221
ge11cn14enus_a86c1525b786_6cdd7e694698_26dea341800a1

HTTP/2 frames (Akamai)

fingerprintco-occurrences
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, +43 more.The fingerprint page shows the full measured match list. More on the catalog.4
1:65536;2:0;4:6291456;6:262144|15663105|3:1:0:256|m,a,s,p2
1:65536;2:0;4:6291456;6:262144;6890:287753361|15663105|1:1:0:220|m,a,s,p1
1:65536;2:0;4:6291456;6:262144;39546:3875415964|15663105|1:1:0:220|m,a,s,p1
1:65536;2:0;4:6291456;6:262144;10874:1438424279|15663105|1:1:0:220|m,a,s,p1
1:65536;2:0;4:6291456;6:262144;39514:3962517072|15663105|1:1:0:220|m,a,s,p1
1:65536;2:0;4:6291456;6:262144|15663105|5:1:0:256|m,a,s,p1

TCP SYN (JA4T)

fingerprintco-occurrences
62727_2-4-8-1-3_1460_1020

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/151.0.0.0 Safari/537.3612
Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:109.0) Gecko/20100101 Firefox/109.04
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/150.0.0.0 Safari/537.36 Edg/150.0.0.04

Country

fingerprintco-occurrences
US · United States20

Network (ASN)

fingerprintco-occurrences
AS16509 · Amazon.com, Inc.20

Cross-transport links

TLS ClientHello fingerprints observed from the same client via the beacon's correlation id on the other transport (e.g. this stack over TCP ↔ that stack over QUIC).

fingerprintlinked observations
q13d0311h3_55b375c5d22e_653d80c3fe9d4