TCP SYN (p0f)

4:43+21:0:1460:mss*29,12:mss,sok,ts,nop,ws:df,id+:0

first seen 2026-10-23 22:05 · last seen 2026-10-30 12:47 · JSON

Last 7 days (1 observations)

Distinct clients per day (last 30 days, peak 2/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 TTL43+21
Options length0
MSS1460
Window sizemss*29
Window scale12
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_8537cf56674e2
t13d3112h1_e8f1e7e78f70_d41ae481755e1

HTTP request (JA4H)

fingerprintco-occurrences
ge20nn030000_bf75ddd0bb29_000000000000_0000000000002
ge11nn050000_be0d0b335e46_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.2

TCP SYN (JA4T)

fingerprintco-occurrences
42340_2-4-8-1-3_1460_123

User-Agent

fingerprintco-occurrences
curl/8.14.12
Mozilla/5.0 (Linux; Android 16; Pixel 9 Pro) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/138.0.7204.93 Mobile Safari/537.361

Country

fingerprintco-occurrences
GB · United Kingdom1
FR · France1
CN · China1

Network (ASN)

fingerprintco-occurrences
AS55990 · Huawei Cloud Service data center1
AS16276 · OVH SAS1
AS215311 · Regxa Company for Information Technology Ltd1

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.2
001d,0017,001e,0019,0018,0100,0101,0102,0103,0104 Match?Exact match in Thumbprint's published controlled catalog captures: php-guzzle 8.3.1, curl 7.88.1, curl 8.13.0, +10 more.The fingerprint page shows the full measured match list. More on the catalog.1