TCP SYN (p0f)

4:53+11:0:1460:mss*29,12:mss,sok,ts,nop,ws:df,id+:0

first seen 2026-06-11 02:40 · last seen 2026-08-31 15:00 · 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 version4
Initial TTL53+11
Options length0
MSS1460
Window sizemss*29
Window scale12
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
t13d190900_9dc949149365_97f8aa674fd96
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.5
t13d1713h2_5b57614c22b0_f81080dfc5573
t13d191100_9dc949149365_e5728521abd42
t13d1414h2_cbb2034c60b8_1bd98dace7752
t13d251100_b78ed14e2fd0_ab7e3b40a6772
t13d4412h1_fd39b124ee10_58ed7828516f1
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

HTTP request (JA4H)

fingerprintco-occurrences
ge11nn040000_209bf58f7e8c_000000000000_0000000000008
ge11nn030000_0db47b7d240d_000000000000_0000000000004
ge20nn11enus_bd1a02c579a6_000000000000_0000000000003
ge11nn030000_72be10f4ec6f_000000000000_0000000000002
ge20nn040000_88d30a62b7ad_000000000000_0000000000001
ge11nr030000_0db47b7d240d_000000000000_0000000000001
ge20nn040000_be74ea4f9dce_000000000000_0000000000001
ge11nn050000_b223a0ebb0b5_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: python-requests 2.34.2, python-requests 2.33.1, python-requests 2.32.3.The fingerprint page shows the full measured match list. More on the catalog.1
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.1

HTTP/2 frames (Akamai)

fingerprintco-occurrences
2:0;4:4194304;5:16384;6:10485760|1073741824|0|a,m,p,s Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.26.6, go-net/http 1.26.8, go-net/http 1.26.7, +6 more.The fingerprint page shows the full measured match list. More on the catalog.2
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
1:65536;4:131072;5:16384|12517377|3:0:0:201,5:0:0:101,7:0:0:1,9:0:7:1,11:0:3:1,13:0:0:241,15:0:13:42|m,p,a,s1
1:65536;4:131072;5:16384|12517377|3:0:0:201,5:0:0:101,7:0:0:1,9:0:7:1,11:0:3:1,13:0:0:241,17:0:13:42|m,p,a,s1
1:65536;4:131072;5:16384|12517377|3:0:0:201,5:0:0:101,7:0:0:1,9:0:7:1,11:0:3:1,13:0:0:241,19:0:13:42|m,p,a,s1

TCP SYN (JA4T)

fingerprintco-occurrences
42340_2-4-8-1-3_1460_125

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (compatible; SecurityResearch/1.0; )3
Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:109.0) Gecko/20100101 Firefox/115.03
TLM-Audit-Scanner/1.02
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.361
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Ubuntu Chromium/75.0.3770.90 Chrome/75.0.3770.90 Safari/537.361
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.361
Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:133.0) Gecko/20100101 Firefox/133.01
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.361
Opera/9.80 (Macintosh; Intel Mac OS X; U; en) Presto/2.6.30 Version/10.611
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/13.0 Safari/605.1.151

Country

fingerprintco-occurrences
NL · Netherlands20
US · United States1
PL · Poland1

Network (ASN)

fingerprintco-occurrences
AS48090 · TECHOFF SRV LIMITED17
AS49981 · WorldStream B.V.3
AS35179 · Korbank S. A.1
AS2914 · NTT America, Inc.1