TCP SYN (p0f)

4:115+13:0:1460:mss*44,7:mss,sok,ts,nop,ws:df,id+:0

first seen 2026-06-19 22:14 · last seen 2026-07-27 08:24 · JSON

Inconsistencies

User-Agents observed with this fingerprint that contradict what it proves at the wire. all inconsistencies →

fingerprint User-Agent claims wire shows confidence seen first seen last seen

4:115+13:0:1460:mss*44,7:mss,sok,ts,nop,ws:df,id+:0

Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) …

User-Agent claims macOS

TCP SYN initial TTL 115+13 indicates Windows

The initial TTL is set by the sending kernel (64 on Unix-like systems, 128 on Windows) and survives NAT. But VPNs, proxies and tunnels legitimately replace the sending stack, so this check never exceeds medium confidence.

Full User-Agent	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
Observed TTL	115+13 (observed + path distance → initial)
Claimed OS	macOS
Confidence	low — single sighting of an environmental signal

low

2026-07-10

Decomposed attributes

IP version	`4`
Initial TTL	`115+13`
Options length	`0`
MSS	`1460`
Window size	`mss*44`
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
`t13d5311h1_ed6c8d7875f9_518fb456ca59`	11
`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.	2
`t13d1812h1_85036bcba153_d41ae481755e`	1
`t13d591000_a33745022dd6_5ac7197df9d2`	1

HTTP request (JA4H)

fingerprint	co-occurrences
`ge11nn09*000_331a676d1a22_000000000000_000000000000`	4
`ge11nn070000_131b6413da1e_000000000000_000000000000`	2
`ge11nn06*000_04a9c46d9108_000000000000_000000000000`	1
`ge11nn11*000_ca5b15ad0075_000000000000_000000000000`	1
`ge11nn08*000_eba57325dc5b_000000000000_000000000000`	1
`ge11nn030000_7fd797acd99d_000000000000_000000000000`	1
`ge11nn05enus_f27312e47155_000000000000_000000000000`	1
`he11nn050000_be0d0b335e46_000000000000_000000000000`	1
`ge11nn11*000_91f18b973d11_000000000000_000000000000`	1
`ge11nn09*000_9f9efef62992_000000000000_000000000000`	1

TCP SYN (JA4T)

fingerprint	co-occurrences
`64240_2-4-8-1-3_1460_7`	12

User-Agent

fingerprint	co-occurrences
`git/2.39.2`	3
`ShipBoost-Outreach/1.0 (+https://shipboost.com)`	2
`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`	1
`python-httpx/0.28.1`	1
`node`	1
`Mozilla/5.0 (compatible; prod-tracker/1.0; +https://github.com/jaequery/prod-tracker) facebookexternalhit/1.1`	1
`Mozilla/5.0 (compatible; aiii.news/1.0)`	1
`Mozilla/5.0 (compatible; HyveNews/1.0; +https://hyvenews.com)`	1
`Mozilla/5.0 (compatible; FounderDeckBot/1.0; +https://founderdeck.app)`	1
`OutpaceBot/1.0 (Company-Size Enrichment)`	1

Country

fingerprint	co-occurrences
`US` · United States	15

Network (ASN)

fingerprint	co-occurrences
`AS14618` · Amazon.com, Inc.	15