TCP SYN (p0f)

4:49+15:0:1424:mss*20,7:mss,sok,ts,nop,ws:df,id+:0

first seen 2026-06-11 02:09 · last seen 2026-10-31 11:06 · JSON

Last 7 days (179 observations)

Distinct clients per day (last 30 days, peak 34/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	`49+15`
Options length	`0`
MSS	`1424`
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
`t13d190900_9dc949149365_97f8aa674fd9`	1370
`t13d131100_f57a46bbacb6_e5728521abd4`	1084
`t13d131000_f57a46bbacb6_e7c285222651` Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.23.12.The fingerprint page shows the full measured match list. More on the catalog.	315
`t13d311000_e8f1e7e78f70_5ac7197df9d2`	2

HTTP request (JA4H)

fingerprint	co-occurrences
`ge11nn10zhcn_9c0cf7475f83_000000000000_000000000000`	1932
`ge11nr10zhcn_9c0cf7475f83_000000000000_000000000000`	495
`ge11nn08zhcn_bd35aedc6348_000000000000_000000000000`	137
`ge11nr08zhcn_bd35aedc6348_000000000000_000000000000`	109
`ge11nn10zhcn_986c3fb09fa9_000000000000_000000000000`	81
`ge11nr10zhcn_986c3fb09fa9_000000000000_000000000000`	15
`ge11nn05zhcn_65b616753dd4_000000000000_000000000000`	2

TCP SYN (JA4T)

fingerprint	co-occurrences
`29200_2-4-8-1-3_1424_7`	2416

User-Agent

fingerprint	co-occurrences
`Mozilla/5.0 (iPhone; CPU iPhone OS 13_2_3 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/13.0.3 Mobile/15E148 Safari/604.1`	2769
`Sogou web spider/4.0(+http://www.sogou.com/docs/help/webmasters.htm#07)`	2

Country

fingerprint	co-occurrences
`US` · United States	2099
`JP` · Japan	351
`BR` · Brazil	117
`SG` · Singapore	111
`DE` · Germany	83
`CN` · China	10

Network (ASN)

fingerprint	co-occurrences
`AS132203` · Tencent Building, Kejizhongyi Avenue	2761
`AS45090` · Shenzhen Tencent Computer Systems Company Limited	8
`AS134756` · CHINANET Nanjing Jishan IDC network	2

TLS supported groups

fingerprint	co-occurrences
`11ec,001d,0017,0018,0019` Match?Exact match in Thumbprint's published controlled catalog captures: firefox 157.0.1, firefox-esr 153.5.1esr, firefox 158.0.1, +3 more.The fingerprint page shows the full measured match list. More on the catalog.	258