TCP SYN (p0f)

4:46+18:0:1452:65535,6:mss,nop,ws,nop,nop,ts,sok,eol+1:df,ecn:0

first seen 2026-07-01 16:03 · last seen 2026-08-19 09:56 · 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 version	`4`
Initial TTL	`46+18`
Options length	`0`
MSS	`1452`
Window size	`65535`
Window scale	`6`
Options layout	`mss,nop,ws,nop,nop,ts,sok,eol+1`
Quirks	`df,ecn`
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
`t13d1712h1_ab0a1bf427ad_882d495ac381`	1
`t13d5212h1_b262b3658495_8e6e362c5eac` Match?Exact match in Thumbprint's published controlled catalog captures: node-fetch 24.19.0, node-fetch 22.23.1, node-fetch 24.21.0, +6 more.The fingerprint page shows the full measured match list. More on the catalog.	1
`t13d181000_5d04281c6031_78e6aca7449b`	1
`t13d3012h2_1d37bd780c83_882d495ac381` Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.21.0, curl 8.22.0, curl 8.20.0, +6 more.The fingerprint page shows the full measured match list. More on the catalog.	1

HTTP request (JA4H)

fingerprint	co-occurrences
`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
`ge11nn07enus_a240cbfd2cfc_000000000000_000000000000`	1
`ge11nn050000_2469c960a647_000000000000_000000000000`	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)

fingerprint	co-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, +7 more.The fingerprint page shows the full measured match list. More on the catalog.	1

TCP SYN (JA4T)

fingerprint	co-occurrences
`65535_2-1-3-1-1-8-4-0-0_1452_6`	4

User-Agent

fingerprint	co-occurrences
`Mozilla/5.0 (Macintosh; Intel Mac OS X 14_7_2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/122.0.0.0 Safari/537.36`	1
`curl/8.21.0`	1
`Mozilla/5.0 (compatible; ShowHNClassifier/1.0)`	1
`Claude-User (claude-code/2.1.234; +https://support.anthropic.com/)`	1

Country

fingerprint	co-occurrences
`CN` · China	2
`VN` · Vietnam	1
`AE` · United Arab Emirates	1

Network (ASN)

fingerprint	co-occurrences
`AS4134` · CHINANET BACKBONE	2
`AS45899` · VNPT Corp	1
`AS5384` · Emirates Internet	1