TCP SYN (p0f)

6:57+7:0:1440:mss*45,7:mss,sok,ts,nop,ws:flow:0

first seen 2026-06-26 09:27 · last seen 2026-09-04 09:31 · 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 version6
Initial TTL57+7
Options length0
MSS1440
Window sizemss*45
Window scale7
Options layoutmss,sok,ts,nop,ws
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
t13d1312h1_f57a46bbacb6_ab7e3b40a67711
t13d1516h2_8daaf6152771_eeeea65629606
t13d1515h2_8daaf6152771_5c2c66f702b04
t13d3113h2_e8f1e7e78f70_ce5650b735ce2
t13d1516h2_8daaf6152771_d8a2da3f94cd Match?Exact match in Thumbprint's published controlled catalog captures: chromium 149.0.7827.102, chrome 149.0.7827.102, chrome 149.0.7827.156, +25 more.The fingerprint page shows the full measured match list. More on the catalog.1
t13d4313h1_c7886603b240_d339722ba4af1
t13d131100_f57a46bbacb6_ab7e3b40a677 Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.26.6, go-net/http 1.26.5, go-net/http 1.26.4.The fingerprint page shows the full measured match list. More on the catalog.1
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
t13d1515h1_8daaf6152771_de4a06bb82e31

HTTP request (JA4H)

fingerprintco-occurrences
ge11nn040000_e1d2031bdfea_000000000000_0000000000006
ge11nr040000_e1d2031bdfea_000000000000_0000000000004
ge20nr12enus_1204b4dfdccd_000000000000_0000000000004
ge20nr13enus_dee81a311bfc_000000000000_0000000000004
ge20nn020000_5594a17e7e7e_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.7.1, curl 8.5.0, curl 8.18.0, +9 more.The fingerprint page shows the full measured match list. More on the catalog.2
ge20nn13enus_dee81a311bfc_000000000000_0000000000002
ge20nr100000_9e93078f8017_000000000000_0000000000001
ge11nr030000_cd680697de12_000000000000_0000000000001
ge11nn050000_be0d0b335e46_000000000000_0000000000001
he11nn030000_fe444ad14866_000000000000_0000000000001

HTTP/2 frames (Akamai)

fingerprintco-occurrences
3:100;4:33554432;2:0|33488897|0|m,p,s,a Match?Exact match in Thumbprint's published controlled catalog captures: php-curl 7.88.1.The fingerprint page shows the full measured match list. More on the catalog.2
1:4096;2:0;4:32768;5:16384|12517377|3:0:0:22|m,p,a,s2
1:4096;2:0;4:32768;5:16384|12517377|3:0:0:42|m,p,a,s2
1:65536;2:0;4:6291456;6:262144|15663105|1:1:0:220|m,a,s,p Match?Exact match in Thumbprint's published controlled catalog captures: chrome 150.0.7871.187, chromium 149.0.7827.102, chrome 149.0.7827.102, +59 more.The fingerprint page shows the full measured match list. More on the catalog.1
1:4096;2:0;4:32768;5:16384|12517377|5:0:0:22|m,p,a,s1
1:4096;2:0;4:32768;5:16384|12517377|7:0:0:22|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|5:0:0:42|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
64800_2-4-8-1-3_1440_727

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (Android 16; Mobile; rv:154.0) Gecko/154.0 Firefox/154.010
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/147.0.0.0 Safari/537.36 Edg/146.0.3856.1093
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/147.0.0.0 Safari/537.362
Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:149.0) Gecko/20100101 Firefox/149.02
Mozilla/5.0 (Macintosh; Intel Mac OS X 15.7; rv:149.0) Gecko/20100101 Firefox/149.02
curl/7.81.02
Go-http-client/1.11
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/147.0.0.0 Safari/537.361
Mozilla/5.0 (Windows NT 10.0; Win64; x64)1
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/114.0.0.0 Safari/537.361

Country

fingerprintco-occurrences
US · United States15
NL · Netherlands12
CZ · Czechia1

Network (ASN)

fingerprintco-occurrences
AS7203 · Leaseweb USA, Inc.12
AS56971 · AS56971 Cloud10
AS60781 · LeaseWeb Netherlands B.V.2
AS40021 · Contabo Inc.1
AS16591 · Google Fiber Inc.1
AS64245 · DigitalFyre Internet Solutions, LLC.1
AS62212 · SmartApe OU1

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
q13d0311h3_55b375c5d22e_653d80c3fe9d1