TCP SYN (p0f)

6:50+14:0:8440:mss*7,7:mss,nop,nop,sok,nop,ws:flow:0

first seen 2026-07-09 07:45 · last seen 2026-08-23 01:53 · 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 version6
Initial TTL50+14
Options length0
MSS8440
Window sizemss*7
Window scale7
Options layoutmss,nop,nop,sok,nop,ws
Quirksflow
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
t13d2512h2_b78ed14e2fd0_ab7e3b40a6779
t13d3112h1_e8f1e7e78f70_24695f2957a74
t13d3113h1_e8f1e7e78f70_d339722ba4af3
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.1

HTTP request (JA4H)

fingerprintco-occurrences
ge20nr020000_fb4f949fd323_000000000000_0000000000009
ge11nn030000_7dedce931117_000000000000_0000000000003
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
ge11nn060000_59ac9c97ec52_000000000000_0000000000001
ge11nn060000_f6476fbaf741_000000000000_0000000000001
ge11nn050000_70510fe33346_000000000000_0000000000001
ge20nn10enus_f7ad313dcc59_000000000000_0000000000001

HTTP/2 frames (Akamai)

fingerprintco-occurrences
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 1.26.8, go-net/http 1.26.7, +6 more.The fingerprint page shows the full measured match list. More on the catalog.9
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.1

TCP SYN (JA4T)

fingerprintco-occurrences
59080_2-1-1-4-1-3_8440_717

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/92.0.4515.159 Safari/537.369
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/83.0.4103.61 Safari/537.364
python-urllib3/2.7.02
ncsrv1
SSLVPN-Client/3.01

Country

fingerprintco-occurrences
US · United States14
CA · Canada2
AU · Australia1

Network (ASN)

fingerprintco-occurrences
AS63949 · Akamai Connected Cloud17