TCP SYN (p0f)

4:33+31:0:1460:65535,6:mss,nop,ws,nop,nop,ts,sok,eol+1:df:0

first seen 2026-09-28 13:37 · last seen 2026-09-28 13:48 · JSON

Decomposed attributes

IP version4
Initial TTL33+31
Options length0
MSS1460
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
t13d1517h2_8daaf6152771_3cbfd9057e0d Match?Exact match in Thumbprint's published controlled catalog captures: firefox 155.0.1, firefox 154.0, firefox 156.0, +7 more.The fingerprint page shows the full measured match list. More on the catalog.17

HTTP request (JA4H)

fingerprintco-occurrences
ge20nn14enus_d2a148ad830b_000000000000_00000000000012
ge20nr12enus_979a40433f82_000000000000_0000000000003
ge20nr14enus_d2a148ad830b_000000000000_0000000000002

HTTP/2 frames (Akamai)

fingerprintco-occurrences
1:65536;2:0;4:131072;5:16384|12517377|3:0:0:22|m,p,a,s Match?Exact match in Thumbprint's published controlled catalog captures: firefox 153.0, firefox 153.0.3, firefox 155.0.1, +31 more.The fingerprint page shows the full measured match list. More on the catalog.3
1:65536;2:0;4:131072;5:16384|12517377|3:0:0:42|m,p,a,s Match?Exact match in Thumbprint's published controlled catalog captures: firefox 154.0, firefox 152.0.5, firefox 152.0.1, +3 more.The fingerprint page shows the full measured match list. More on the catalog.1
1:65536;2:0;4:131072;5:16384|12517377|9:0:0:42|m,p,a,s1
1:65536;2:0;4:131072;5:16384|12517377|17:0:0:42|m,p,a,s1
1:65536;2:0;4:131072;5:16384|12517377|11:0:0:42|m,p,a,s1
1:65536;2:0;4:131072;5:16384|12517377|13:0:0:42|m,p,a,s1
1:65536;2:0;4:131072;5:16384|12517377|15:0:0:42|m,p,a,s1
1:65536;2:0;4:131072;5:16384|12517377|19:0:0:42|m,p,a,s1
1:65536;2:0;4:131072;5:16384|12517377|21:0:0:42|m,p,a,s1
1:65536;2:0;4:131072;5:16384|12517377|25:0:0:42|m,p,a,s1

TCP SYN (JA4T)

fingerprintco-occurrences
65535_2-1-3-1-1-8-4-0-0_1460_617

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:156.0) Gecko/20100101 Firefox/156.017

Country

fingerprintco-occurrences
FI · Finland17

Network (ASN)

fingerprintco-occurrences
AS719 · Elisa Oyj17

Cross-transport links

TLS ClientHello fingerprints observed from the same client via the beacon's correlation id on the other transport (e.g. this stack over TCP ↔ that stack over QUIC).

fingerprintlinked observations
q13d0315h3_55b375c5d22e_bb76f32061e31