TCP SYN (p0f)

4:49+15:0:1460:mss*44,9:mss,sok,ts,nop,ws:df,id+:0

first seen 2026-06-12 12:16 · last seen 2026-10-27 09:29 · JSON

Last 7 days (1 observations)

Distinct clients per day (last 30 days, peak 8/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 TTL49+15
Options length0
MSS1460
Window sizemss*44
Window scale9
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
t13d3013h2_1d37bd780c83_8537cf56674e7
t13d4312h1_c7886603b240_b26ce05bbdd64
t13i131000_f57a46bbacb6_ab7e3b40a6772
t13d5212h1_b262b3658495_8e6e362c5eac Match?Exact match in Thumbprint's published controlled catalog captures: node-fetch 24.21.0, node-fetch 24.19.0, node-fetch 22.23.1, +8 more.The fingerprint page shows the full measured match list. More on the catalog.2
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
t13d1910h1_9dc949149365_97f8aa674fd91

HTTP request (JA4H)

fingerprintco-occurrences
ge20nn030000_bf75ddd0bb29_000000000000_0000000000007
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.4
ge11nn05enus_8eebf5ac87f3_000000000000_0000000000002
ge11nn07*000_131b6413da1e_000000000000_0000000000002
ge11nn040000_e1d2031bdfea_000000000000_0000000000001
ge20nn13enus_0c2c1d640f3e_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: chrome 151.0.7922.137, chrome 151.0.7922.170, chrome 151.0.7922.108, +36 more.The fingerprint page shows the full measured match list. More on the catalog.1

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.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.1

TCP SYN (JA4T)

fingerprintco-occurrences
64240_2-4-8-1-3_1460_915

User-Agent

fingerprintco-occurrences
curl/8.14.17
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.362
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/146.0.0.0 Safari/537.362
ConversionPatch research/1.02
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.361
Mozilla/5.0 (iPhone; CPU iPhone OS 8_1_1 like Mac OS X) AppleWebKit/600.1.4 (KHTML, like Gecko) Version/8.0 Mobile/12B435 Safari/600.1.41
Mozilla/5.0 (Windows; U; Windows NT 5.1; fr-FR) AppleWebKit/525.28 (KHTML, like Gecko) Version/3.2.2 Safari/525.28.11
Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:156.0) Gecko/20100101 Firefox/156.01

Country

fingerprintco-occurrences
SE · Sweden4
US · United States3
FR · France2
IN · India2
AU · Australia1
DE · Germany1
NL · Netherlands1
JP · Japan1
GB · United Kingdom1
BE · Belgium1

Network (ASN)

fingerprintco-occurrences
AS63949 · Akamai Connected Cloud6
AS142477 · Nivid Telecom India Private Limited2
AS208137 · Feo Prest SRL1
AS16509 · Amazon.com, Inc.1
AS14061 · DigitalOcean, LLC1
AS213790 · Limited Network LTD1
AS7922 · Comcast Cable Communications, LLC1
AS15557 · Societe Francaise Du Radiotelephone - SFR SA1
AS3215 · Orange S.A.1
AS30036 · Mediacom Communications Corp1

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
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.3
0a0a,11ec,001d,0017,0018 Match?Exact match in Thumbprint's published controlled catalog captures: chrome 155.0.8059.40, chrome 156.0.8078.73, chromium 156.0.8078.47, +8 more.The fingerprint page shows the full measured match list. More on the catalog.1
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.1