TCP SYN (p0f)

4:115+13:0:1460:mss*29,13:mss,nop,nop,sok,nop,ws:df,id+:0

first seen 2026-06-29 23:12 · last seen 2026-10-22 21:49 · 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 TTL115+13
Options length0
MSS1460
Window sizemss*29
Window scale13
Options layoutmss,nop,nop,sok,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
t13d271200_c42a7efa14d1_a141b6f9fa1c3
t13d131000_f57a46bbacb6_e7c285222651 Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.23.12.The fingerprint page shows the full measured match list. More on the catalog.1

HTTP request (JA4H)

fingerprintco-occurrences
ge11nn040000_e1d2031bdfea_000000000000_0000000000001
ge11nn11enus_59d4f6088dec_000000000000_0000000000001
po11nn060000_26b3802e1dc5_000000000000_0000000000001
ge11nn060000_f3b4d7f72ec1_000000000000_0000000000001

TCP SYN (JA4T)

fingerprintco-occurrences
42340_2-1-1-4-1-3_1460_134

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0 Safari/537.363
Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:109.0) Gecko/20100101 Firefox/117.01

Country

fingerprintco-occurrences
FR · France3
SE · Sweden1

Network (ASN)

fingerprintco-occurrences
AS46475 · Limestone Networks, Inc.4

TLS supported groups

fingerprintco-occurrences
11ec,11eb,11ed,001d,0017,001e,0019,0018,0100,0101,0102,0103,0104 Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.18.0.The fingerprint page shows the full measured match list. More on the catalog.3