TCP SYN (p0f)

4:54+10:0:1460:mss*44,10:mss,sok,ts,nop,ws:df,id+:0

first seen 2026-06-25 22:06 · last seen 2026-10-27 23:04 · JSON

Distinct clients per day (last 30 days, peak 6/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 TTL54+10
Options length0
MSS1460
Window sizemss*44
Window scale10
Options layoutmss,sok,ts,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
t13d101000_61a7ad8aa9b6_3ea2f44fd1af111
t13d1713h1_5b57614c22b0_eca864cca44a15
t13d1516h2_8daaf6152771_02713d6af862 Match?Exact match in Thumbprint's published controlled catalog captures: chromium 131.0.6778.33, chromium 134.0.6998.35, chromium 133.0.6943.16.The fingerprint page shows the full measured match list. More on the catalog.14
t13d1715h2_5b57614c22b0_a54fffd0eb6111
t13d171000_5b57614c22b0_78e6aca7449b10
t13d1513h2_8daaf6152771_eca864cca44a10
t12d070400_67e63544eb68_b4ef8340317f8
t13d3013h2_1d37bd780c83_8537cf56674e7
t13d1515h1_8daaf6152771_de4a06bb82e37
t13d1514h2_8daaf6152771_43ade6aba3df7

HTTP request (JA4H)

fingerprintco-occurrences
ge11nn050000_fdb72fc7d4c1_000000000000_000000000000111
ge20nn020000_b89ce445e0b3_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.21.13, go-net/http 1.27.1, go-net/http 1.27.0, +14 more.The fingerprint page shows the full measured match list. More on the catalog.13
ge11nn030000_58c83775e1a3_000000000000_00000000000011
ge20nr12enus_a72b71f519fc_000000000000_00000000000011
ge20nr12enus_df25ac57a18f_000000000000_00000000000010
ge11nn13enus_9db22d02e17a_000000000000_0000000000009
ge11nn040000_4f6f4aad0c1e_000000000000_0000000000008
ge20nn030000_bf75ddd0bb29_000000000000_0000000000006
ge20nr12enus_7f8aecb7bbee_000000000000_0000000000006
ge20nr11enus_187a9385d229_000000000000_0000000000005

HTTP/2 frames (Akamai)

fingerprintco-occurrences
4:16777216|16711681|0|m,p,a,s17
3:100;4:65536;2:0|1048510465|0|m,s,a,p Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.13.0, curl 8.18.0, curl 8.21.0, +8 more.The fingerprint page shows the full measured match list. More on the catalog.8
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 152.0.7977.83, +81 more.The fingerprint page shows the full measured match list. More on the catalog.7
1:65536;2:0;4:6291456;6:262144|15663105|1:1:0:256|m,a,s,p Match?Exact match in Thumbprint's published controlled catalog captures: chromium 131.0.6778.33, chromium 151.0.7922.34, chrome 151.0.7922.137, +57 more.The fingerprint page shows the full measured match list. More on the catalog.5
1:65536;2:0;4:6291456;6:262144|15663105|7:1:0:220|m,a,s,p5
1:65536;2:0;4:6291456;6:262144|15663105|9:1:0:220|m,a,s,p5
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
2:0;4:2097152;5:16384;6:16384|5177345|0|m,s,a,p Match?Exact match in Thumbprint's published controlled catalog captures: rust-reqwest 0.12.28, rust-reqwest 0.13.5, rust-reqwest 0.13.4, +4 more.The fingerprint page shows the full measured match list. More on the catalog.3
1:65536;2:0;4:6291456;6:262144|15663105|3:1:1:220|m,a,s,p Match?Exact match in Thumbprint's published controlled catalog captures: chrome 150.0.7871.128, chrome 150.0.7871.115, chrome 154.0.8037.58, +8 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.2

TCP SYN (JA4T)

fingerprintco-occurrences
64240_2-4-8-1-3_1460_10255

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/147.0.0.0 Safari/537.36111
Mozilla/5.0 (X11; Linux x86_64; rv:140.0) Gecko/20100101 Firefox/140.017
Mozilla/5.0 (Linux; Android 15; sdk_gphone64_x86_64 Build/AE3A.240806.043; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/124.0.6367.219 Mobile Safari/537.3613
Dalvik/2.1.0 (Linux; U; Android 17; sdk_gphone64_x86_64 Build/CE2A.260420.019)8
Ktor client7
okhttp/4.9.27
curl/8.14.16
Dalvik/2.1.0 (Linux; U; Android 15; sdk_gphone64_x86_64 Build/AE3A.240806.043)6
ktor-client5
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/154.0.0.0 Safari/537.365

Country

fingerprintco-occurrences
US · United States98
TR · Turkey68
NL · Netherlands57
CA · Canada18
AU · Australia7
SE · Sweden6
NO · Norway1
CH · Switzerland1
SK · Slovakia1

Network (ASN)

fingerprintco-occurrences
AS219502 · Storm Industries LLC111
AS132892 · Cloudflare, Inc.79
AS209854 · Cyberzone S.A.18
AS49981 · WorldStream B.V.14
AS38195 · Superloop7
AS214640 · Hostup AB6
AS212238 · Datacamp Limited5
AS208172 · Proton AG4
AS206092 · F.N.S. HOLDINGS LIMITED4
AS19318 · Interserver, Inc3

TLS supported groups

fingerprintco-occurrences
11ec,001d,0017,001e,0018,0019,0100,0101 Match?Exact match in Thumbprint's published controlled catalog captures: node-fetch 24.22.1, python-httpx 0.28.1, python-requests 2.34.2, +2 more.The fingerprint page shows the full measured match list. More on the catalog.7
0a0a,001d,0017,00181
11ec,11eb,11ed,001d,0017,0018,0019 Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.27.3, go-net/http 1.26.10.The fingerprint page shows the full measured match list. More on the catalog.1

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_653d80c3fe9d3