TCP SYN (p0f)

4:113+15:0:1460:mss*44,8:mss,nop,ws,nop,nop,sok:df,id+,ecn:0

first seen 2026-06-11 01:52 · last seen 2026-08-29 10:43 · 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 TTL113+15
Options length0
MSS1460
Window sizemss*44
Window scale8
Options layoutmss,nop,ws,nop,nop,sok
Quirksdf,id+,ecn
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
t13d311000_e8f1e7e78f70_518fb456ca5914
t12d860600_e18388e7f3a3_a1e9356827954
t13d1312h2_f57a46bbacb6_e5728521abd43
t12d4907h1_730fb1b0ac6a_8587f467d9ea2
t13d1712h1_ab0a1bf427ad_882d495ac3812
t13d221100_231e334592e8_36bf25f296df1
t12d210700_76e208dd3e22_f28add8e7af01
t13d1812h1_85036bcba153_d41ae481755e1

HTTP request (JA4H)

fingerprintco-occurrences
ge11nr12enus_25d14dfbfd78_000000000000_0000000000005
ge11nr09enus_a1ca5f23d14f_000000000000_0000000000004
ge11nr10enus_4cb5ac3f98a2_000000000000_0000000000003
ge20nr030000_0db47b7d240d_000000000000_0000000000003
ge11nn06enus_ff6fe191b79d_000000000000_0000000000003
ge11nr07enus_95ab0b2cda8a_000000000000_0000000000002
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
ge11nr07enus_9ef08057ba86_000000000000_0000000000001
ge11nn010000_4740ae6347b0_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: rust-hyper 1.11.0, rust-hyper 1.11.1, rust-hyper 1.10.1.The fingerprint page shows the full measured match list. More on the catalog.1
ge11nn15enus_35372a7bda31_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.3

TCP SYN (JA4T)

fingerprintco-occurrences
64240_2-1-3-1-1-4_1460_88

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.108 Safari/537.363
Mozilla/5.02
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/147.0.0.0 Safari/537.362
Mozlila/5.0 (Linux; Android 7.0; SM-G892A Bulid/NRD90M; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/60.0.3112.107 Moblie Safari/537.362
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/117.0.5938.132 Safari/537.361
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 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.124 Safari/537.361
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.124 Safari/537.361
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.124 Safari/537.361
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.361

Country

fingerprintco-occurrences
FI · Finland11
NL · Netherlands6
GB · United Kingdom3
US · United States2
TR · Turkey2
DE · Germany1
SG · Singapore1
IN · India1
LT · Lithuania1

Network (ASN)

fingerprintco-occurrences
AS24940 · Hetzner Online GmbH11
AS197170 · TechTies Inc.3
AS210558 · 1337 Services GmbH3
AS201579 · HOSTGNOME LTD3
AS219502 · Storm Industries LLC2
AS14061 · DigitalOcean, LLC1
AS22295 · Advin Services LLC1
AS20473 · The Constant Company, LLC1
AS215930 · CIPHER OPERATIONS DOO BEOGRAD - NOVI BEOGRAD1
AS24961 · WIIT AG1