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 2026-10-28 23:35 · JSON

Last 7 days (3 observations)

Distinct clients per day (last 30 days, peak 2/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
t13d1515h2_8daaf6152771_a54fffd0eb613
t13d1713h2_5b57614c22b0_f81080dfc5573
t13d1414h2_cbb2034c60b8_1bd98dace7752
t13d251100_b78ed14e2fd0_ab7e3b40a6772
t13d191100_9dc949149365_e5728521abd42
t13d1011h2_18ef40b21276_879711aa9f162
t13d3013h2_1d37bd780c83_8537cf56674e2
t13d591000_a33745022dd6_1f22a2ca17c42

HTTP request (JA4H)

fingerprintco-occurrences
ge11nn040000_209bf58f7e8c_000000000000_0000000000008
ge11nn030000_0db47b7d240d_000000000000_0000000000004
ge20nn11enus_bd1a02c579a6_000000000000_0000000000003
ge11nn030000_72be10f4ec6f_000000000000_0000000000002
ge20nn14enus_068ebe3632ec_000000000000_0000000000002
ge20nr11enus_187a9385d229_000000000000_0000000000002
ge20nn030000_bf75ddd0bb29_000000000000_0000000000002
ge11nn07enus_71b742b5154a_000000000000_0000000000002
ge20nn040000_88d30a62b7ad_000000000000_0000000000001
ge20nn040000_be74ea4f9dce_000000000000_0000000000001

HTTP/2 frames (Akamai)

fingerprintco-occurrences
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.2
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.2
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 1.26.10, go-net/http 1.26.9, +8 more.The fingerprint page shows the full measured match list. More on the catalog.2
0|00|0|m,s,a,p2
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.1
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
1:16384;2:0;3:0;4:16777216;5:16384;6:393216|33488897|0|a,m,p,s Match?Exact match in Thumbprint's published controlled catalog captures: java-httpclient 17.0.19, java-httpclient 11.0.31, java-httpclient 25.0.4.1, +7 more.The fingerprint page shows the full measured match list. More on the catalog.1
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

TCP SYN (JA4T)

fingerprintco-occurrences
42340_2-4-8-1-3_1460_1216

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (compatible; SecurityResearch/1.0; )3
curl/8.7.13
Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:109.0) Gecko/20100101 Firefox/115.03
Mozilla/5.0 (X11; Linux x86_64; rv:156.0) Gecko/20100101 Firefox/156.03
TLM-Audit-Scanner/1.02
curl/8.14.12
Mozilla/5.0 (compatible; The Lounge IRC Client; +https://github.com/thelounge/thelounge) facebookexternalhit/1.1 Twitterbot/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

Country

fingerprintco-occurrences
NL · Netherlands25
FR · France4
US · United States1
SG · Singapore1
KR · South Korea1
PL · Poland1

Network (ASN)

fingerprintco-occurrences
AS48090 · TECHOFF SRV LIMITED17
AS49981 · WorldStream B.V.6
AS212238 · Datacamp Limited2
AS211590 · Bucklog SARL2
AS211839 · JMT Paso Limited2
AS35179 · Korbank S. A.1
AS138997 · Eons Data Communications Limited1
AS2914 · NTT America, Inc.1
AS7625 · Kakao Corp1

TLS supported groups

fingerprintco-occurrences
001d,0017,0018,0019 Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.21.13.The fingerprint page shows the full measured match list. More on the catalog.2
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.2
001d,0017,001e,0019,0018,0100,0101,0102,0103,0104 Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.13.0, php-guzzle 8.3.1, curl 7.88.1, +10 more.The fingerprint page shows the full measured match list. More on the catalog.1
001d,0017,0018,0019,001e,0100,0101,0102,0103,0104 Match?Exact match in Thumbprint's published controlled catalog captures: java-httpclient 17.0.19, java-httpclient 11.0.31.The fingerprint page shows the full measured match list. More on the catalog.1