TCP SYN (p0f)

4:54+10:0:1412:mss*44,7:mss,sok,ts,nop,ws:df,id+:0

first seen 2026-06-12 17:01 · last seen 2026-10-28 04:31 · JSON

Last 7 days (3 observations)

Distinct clients per day (last 30 days, peak 10/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 TTL54+10
Options length0
MSS1412
Window sizemss*44
Window scale7
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
t13d3013h2_1d37bd780c83_8537cf56674e10
t13d4312h1_c7886603b240_b26ce05bbdd65
t13d1515h1_8daaf6152771_de4a06bb82e34
t13d4412h1_fd39b124ee10_58ed7828516f3
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
t13i170900_5b57614c22b0_78e6aca7449b1

HTTP request (JA4H)

fingerprintco-occurrences
ge20nn030000_bf75ddd0bb29_000000000000_00000000000010
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.8
ge11nn13enus_9db22d02e17a_000000000000_0000000000004
po11nn060000_8c1b2e3f6532_000000000000_0000000000001
ge11nr19dede_4e9b73ab7510_000000000000_0000000000001
ge11nr18zhtw_45ed06ef2081_000000000000_0000000000001

HTTP/2 frames (Akamai)

fingerprintco-occurrences
3:100;4:65536;2:0|1048510465|0|m,s,a,p Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.13.0, curl 8.18.0, curl 8.21.0, +8 more.The fingerprint page shows the full measured match list. More on the catalog.10

TCP SYN (JA4T)

fingerprintco-occurrences
64240_2-4-8-1-3_1412_724

User-Agent

fingerprintco-occurrences
curl/8.14.110
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/142.0.0.0 Safari/537.362
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/116.0.0.0 Safari/537.362
libredtail-http1
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/146.0.0.0 Safari/537.361
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/122.0.0.0 Safari/537.36 Edg/122.0.0.01
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.361
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/145.0.0.0 Safari/537.361
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/99.0.4844.51 Safari/537.361
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/100.0.4896.75 Safari/537.361

Country

fingerprintco-occurrences
DE · Germany11
ES · Spain5
MX · Mexico2
RU · Russia2
ID · Indonesia1
PE · Peru1
VE · Venezuela1
JM · Jamaica1
NP · Nepal1

Network (ASN)

fingerprintco-occurrences
AS219337 · PLAY2GO - FZCO6
AS215439 · PLAY2GO INTERNATIONAL LIMITED5
AS200845 · AVATEL TELECOM, SA4
AS12389 · PJSC Rostelecom2
AS8151 · Uninet S.A. de C.V.2
AS23693 · PT. Telekomunikasi Selular1
AS12252 · America Movil Peru S.A.C.1
AS264628 · CORPORACION FIBEX TELECOM, C.A.1
AS40786 · Digicel Jamaica1
AS23752 · Nepal Telecommunications Corporation, Internet Services,1

TLS supported groups

fingerprintco-occurrences
11ec,001d,0017,001e,0018,0019,0100,0101 Match?Exact match in Thumbprint's published controlled catalog captures: node-fetch 24.22.1, python-httpx 0.28.1, python-requests 2.34.2, +2 more.The fingerprint page shows the full measured match list. More on the catalog.10
001d,0017,001e,0019,0018,0100,0101,0102,0103,0104 Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.13.0, php-guzzle 8.3.1, curl 7.88.1, +10 more.The fingerprint page shows the full measured match list. More on the catalog.4
11ec,001d,0017,0018,0019 Match?Exact match in Thumbprint's published controlled catalog captures: firefox 157.0.1, firefox-esr 153.5.1esr, firefox 158.0.1, +3 more.The fingerprint page shows the full measured match list. More on the catalog.2