TCP SYN (p0f)

6:49+15:0:1440:32768,10:mss,nop,ws,sok,ts:flow:0

first seen 2026-07-01 18:26 · last seen 2026-10-31 00:28 · JSON

Last 7 days (2 observations)

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 version6
Initial TTL49+15
Options length0
MSS1440
Window size32768
Window scale10
Options layoutmss,nop,ws,sok,ts
Quirksflow
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
t13d1614h2_86a278354501_3dd24b5ebec47
t13d1715h2_5b57614c22b0_a54fffd0eb615
t13d1615h2_86a278354501_a54fffd0eb611

HTTP request (JA4H)

fingerprintco-occurrences
ge20nr11enus_187a9385d229_000000000000_0000000000003
ge20nn12enus_a72b71f519fc_000000000000_0000000000002
ge20nr11ru00_187a9385d229_000000000000_0000000000002
ge20nr12ru00_a72b71f519fc_000000000000_0000000000002
ge20nr11ru00_684b26f0fcdf_000000000000_0000000000002
ge20nn13enus_7e820a765fe5_000000000000_0000000000001
ge20nn11ru00_684b26f0fcdf_000000000000_0000000000001

HTTP/2 frames (Akamai)

fingerprintco-occurrences
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.3
1:4096;2:0;4:32768;5:16384|12517377|3:0:0:22|m,p,a,s2
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, +32 more.The fingerprint page shows the full measured match list. More on the catalog.1
1:4096;2:0;4:32768;5:16384|12517377|3:0:0:42|m,p,a,s1
1:65536;2:0;4:131072;5:16384|12517377|5:0:0:22|m,p,a,s Match?Exact match in Thumbprint's published controlled catalog captures: firefox 153.0.3, firefox 154.0, firefox 153.0, +13 more.The fingerprint page shows the full measured match list. More on the catalog.1
1:65536;2:0;4:131072;5:16384|12517377|7:0:0:22|m,p,a,s Match?Exact match in Thumbprint's published controlled catalog captures: firefox 153.0.3, firefox 158.0.1, firefox 155.0, +4 more.The fingerprint page shows the full measured match list. More on the catalog.1
1:4096;2:0;4:32768;5:16384|12517377|5:0:0:42|m,p,a,s1
1:4096;2:0;4:32768;5:16384|12517377|9:0:0:42|m,p,a,s1
1:4096;2:0;4:32768;5:16384|12517377|11:0:0:42|m,p,a,s1
1:4096;2:0;4:32768;5:16384|12517377|7:0:0:42|m,p,a,s1

TCP SYN (JA4T)

fingerprintco-occurrences
32768_2-1-3-4-8_1440_1013

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (Android 10; Mobile; rv:153.0) Gecko/153.0 Firefox/153.07
Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:140.0) Gecko/20100101 Firefox/140.04
Mozilla/5.0 (X11; Linux x86_64; rv:140.0) Gecko/20100101 Firefox/140.01
Mozilla/5.0 (X11; Linux x86_64; rv:153.0) Gecko/20100101 Firefox/153.01

Country

fingerprintco-occurrences
NL · Netherlands13

Network (ASN)

fingerprintco-occurrences
AS215125 · Church of Cyberology13

TLS supported groups

fingerprintco-occurrences
11ec,001d,0017,0018,0019,0100,01012