TCP SYN (p0f)

4:55+9:0:1360:mss*48,7:mss,sok,ts,nop,ws:df,id+:0

first seen 2026-07-28 08:31 · last seen 2026-09-15 22:16 · 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 version	`4`
Initial TTL	`55+9`
Options length	`0`
MSS	`1360`
Window size	`mss*48`
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
`t12d130600_2d7513195f68_e51b7354d87f`	9
`t13d131100_f57a46bbacb6_ab7e3b40a677` Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.26.6, go-net/http 1.26.5, go-net/http 1.26.4.The fingerprint page shows the full measured match list. More on the catalog.	4
`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.	2

HTTP request (JA4H)

fingerprint	co-occurrences
`ge11nr040000_e1d2031bdfea_000000000000_000000000000`	9
`ge11nr040000_8391bea91fb6_000000000000_000000000000`	3
`ge11nr030000_cd680697de12_000000000000_000000000000`	1
`ge20nn04enus_a1e84a948d10_000000000000_000000000000`	1
`ge20nr04enus_39a3ba4480e8_000000000000_000000000000`	1

HTTP/2 frames (Akamai)

fingerprint	co-occurrences
`2:0;4:4194304;6:10485760\|1073741824\|0\|a,m,p,s` Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.21.13, go-net/http 1.23.12.The fingerprint page shows the full measured match list. More on the catalog.	2

TCP SYN (JA4T)

fingerprint	co-occurrences
`65280_2-4-8-1-3_1360_7`	15

User-Agent

fingerprint	co-occurrences
`Mozilla/5.0 zgrab/0.x`	9
`Go-http-client/1.1`	4
`Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0.0.0 Safari/537.36`	2

Country

fingerprint	co-occurrences
`LT` · Lithuania	9
`SI` · Slovenia	6

Network (ASN)

fingerprint	co-occurrences
`AS213790` · Limited Network LTD	9
`AS197769` · VPS Dedicated LLC	6