TCP SYN (p0f)

6:51+13:0:1440:mss*45,7:mss,nop,nop,sok,nop,ws:flow:0

first seen 2026-07-19 21:44 · last seen 2026-09-14 00:04 · JSON

Last 7 days (4 observations)

Distinct clients per day (last 30 days, peak 3/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 TTL51+13
Options length0
MSS1440
Window sizemss*45
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_ab7e3b40a67712
t13d3112h1_e8f1e7e78f70_24695f2957a77
t13d3113h1_e8f1e7e78f70_d339722ba4af7

HTTP request (JA4H)

fingerprintco-occurrences
ge20nr020000_fb4f949fd323_000000000000_00000000000012
ge11nn030000_7dedce931117_000000000000_0000000000007
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.2
ge11nn050000_70510fe33346_000000000000_0000000000002
ge11nn060000_59ac9c97ec52_000000000000_0000000000001
ge11nn060000_f6476fbaf741_000000000000_0000000000001
ge11nn080000_a58534804c1b_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.12

TCP SYN (JA4T)

fingerprintco-occurrences
64800_2-1-1-4-1-3_1440_726

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/537.3612
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/83.0.4103.61 Safari/537.367
python-urllib3/2.7.04
SSLVPN-Client/3.02
ncsrv1

Country

fingerprintco-occurrences
US · United States25
AU · Australia1

Network (ASN)

fingerprintco-occurrences
AS14061 · DigitalOcean, LLC22
AS63949 · Akamai Connected Cloud4