TCP SYN (p0f)

4:43+21:0:1460:mss*20,9:mss,sok,nop,nop,nop,nop,nop,nop,nop,nop,nop,nop,nop,ws:df,id+:0

first seen 2026-09-03 14:02 · last seen 2026-09-03 14:02 · JSON

Decomposed attributes

IP version	`4`
Initial TTL	`43+21`
Options length	`0`
MSS	`1460`
Window size	`mss*20`
Window scale	`9`
Options layout	`mss,sok,nop,nop,nop,nop,nop,nop,nop,nop,nop,nop,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
`t13d271000_e2a343ec0ac9_c669a5c2c420`	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

HTTP request (JA4H)

fingerprint	co-occurrences
`ge20nr080000_436add3393bb_000000000000_000000000000`	1
`ge11nr08*000_89433754e7d8_000000000000_000000000000`	1
`ge11nr07*000_21892446ffbd_000000000000_000000000000`	1

HTTP/2 frames (Akamai)

fingerprint	co-occurrences
`1:65536;2:0;4:6291456;6:262144\|15663105\|1:1:0:220\|m,a,s,p` Match?Exact match in Thumbprint's published controlled catalog captures: chrome 150.0.7871.187, chromium 149.0.7827.102, chrome 152.0.7977.83, +81 more.The fingerprint page shows the full measured match list. More on the catalog.	1

TCP SYN (JA4T)

fingerprint	co-occurrences
`29200_2-4-1-1-1-1-1-1-1-1-1-1-1-3_1460_9`	3

User-Agent

fingerprint	co-occurrences
`Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/152.0.0.0 Safari/537.36`	2
`Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/126.0.6478.54 Safari/537.36`	1

Country

fingerprint	co-occurrences
`CN` · China	3

Network (ASN)

fingerprint	co-occurrences
`AS23724` · IDC, China Telecommunications Corporation	3

Cross-transport links

TLS ClientHello fingerprints observed from the same client via the beacon's correlation id on the other transport (e.g. this stack over TCP ↔ that stack over QUIC).

fingerprint	linked observations
`q13d0311h3_55b375c5d22e_5a1f323ef56d`	1