TCP SYN (p0f)

4:46+18:0:1280:65535,6:mss,nop,ws,nop,nop,ts,sok,eol+1:df:0

first seen 2026-09-27 13:40 · last seen 2026-09-27 13:40 · JSON

Decomposed attributes

IP version4
Initial TTL46+18
Options length0
MSS1280
Window size65535
Window scale6
Options layoutmss,nop,ws,nop,nop,ts,sok,eol+1
Quirksdf
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
t13d4907h2_0d8feac7bc37_7395dae3b2f3 Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.7.1.The fingerprint page shows the full measured match list. More on the catalog.1
t13d181000_5d04281c6031_78e6aca7449b1

HTTP request (JA4H)

fingerprintco-occurrences
ge20nn020000_5594a17e7e7e_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.7.1, curl 8.5.0, curl 8.13.0, +11 more.The fingerprint page shows the full measured match list. More on the catalog.1
ge11nn050000_2469c960a647_000000000000_0000000000001

HTTP/2 frames (Akamai)

fingerprintco-occurrences
3:100;4:10485760;2:0|1048510465|0|m,s,a,p Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.7.1, curl 8.5.0.The fingerprint page shows the full measured match list. More on the catalog.1

TCP SYN (JA4T)

fingerprintco-occurrences
65535_2-1-3-1-1-8-4-0-0_1280_62

User-Agent

fingerprintco-occurrences
curl/8.4.01
Claude-User (claude-code/2.1.281; +https://support.anthropic.com/)1

Country

fingerprintco-occurrences
AT · Austria2

Network (ASN)

fingerprintco-occurrences
AS9009 · M247 Europe SRL2