TCP SYN (p0f)

4:56+8:0:1460:mss*20,7:mss,sok,ts,nop,ws:df,id+:0

first seen 2026-07-12 05:14 · last seen 2026-10-29 08:29 · JSON

Last 7 days (1 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 version	`4`
Initial TTL	`56+8`
Options length	`0`
MSS	`1460`
Window size	`mss*20`
Window scale	`7`
Options layout	`mss,sok,ts,nop,ws`
Quirks	`df,id+`
Payload class	`0`

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)

fingerprint	co-occurrences
`t13i1909h2_9dc949149365_97f8aa674fd9`	10
`t13i170900_5b57614c22b0_78e6aca7449b`	1
`t13d4312h1_c7886603b240_b26ce05bbdd6`	1
`t13d3013h2_1d37bd780c83_8537cf56674e` Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.18.0.The fingerprint page shows the full measured match list. More on the catalog.	1

HTTP request (JA4H)

fingerprint	co-occurrences
`ge20nr030000_80b089f68b8e_000000000000_000000000000`	9
`ge20nr030000_ff50983941c1_000000000000_000000000000`	1
`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
`ge20nn030000_bf75ddd0bb29_000000000000_000000000000`	1
`ge11nn070000_d0d63ed74832_000000000000_000000000000`	1

HTTP/2 frames (Akamai)

fingerprint	co-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 1.26.10, go-net/http 1.26.9, +8 more.The fingerprint page shows the full measured match list. More on the catalog.	10
`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.	1

TCP SYN (JA4T)

fingerprint	co-occurrences
`29200_2-4-8-1-3_1460_7`	13

User-Agent

fingerprint	co-occurrences
`Mozilla/5.0 (Macintosh; Intel Mac OS X 10.13; rv:61.0) Gecko/20100101 Firefox/72.0`	10
`Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/142.0.0.0 Safari/537.36`	1
`libredtail-http`	1
`curl/8.14.1`	1

Country

fingerprint	co-occurrences
`US` · United States	12
`ID` · Indonesia	1

Network (ASN)

fingerprint	co-occurrences
`AS14061` · DigitalOcean, LLC	11
`AS7713` · PT Telekomunikasi Indonesia	1
`AS400619` · AROSSCLOUD INC.	1

TLS supported groups

fingerprint	co-occurrences
`001d,0017,0018,0019` Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.21.13, curl 8.7.1.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
`11ec,001d,0017,001e,0018,0019,0100,0101` Match?Exact match in Thumbprint's published controlled catalog captures: python-httpx 0.28.1, python-requests 2.34.2, curl 8.23.0, +4 more.The fingerprint page shows the full measured match list. More on the catalog.	1