TLS ClientHello (JA4)

t13d1311h1_f57a46bbacb6_e7c285222651

first seen 2026-09-29 07:57 · last seen 2026-10-28 15:57 · 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

t13d1311h1_f57a46bbacb6_e7c285222651

Mozilla/5.0 (X11; Linux x86_64; rv:140.0) Gecko/…

User-Agent claims Firefox 140.0

TLS cipher list matches no measured Firefox capture

The offered TLS cipher suites match no controlled capture of Firefox. Cipher lists are very stable per browser, so a different one is a real inconsistency — though a TLS-inspecting proxy re-originating the handshake is an honest cause, which holds this at medium.

Full User-Agent	Mozilla/5.0 (X11; Linux x86_64; rv:140.0) Gecko/20100101 Firefox/140.0
Claimed version	140.0
Measured versions	146.0.1, 154.0, 140.0.2, 157.0.1, 151.0.2, 155.0, 153.0.3, 142.0.1, 153.0.4, 152.0.6, 150.0.2, 135.0, 156.0.1, 132.0, 152.0.3, 141.0, 153.0, 151.0.3, 156.0, 152.0.4, 151.0, 152.0.1, 151.0.4, 139.0, 153.0.1, 158.0.1, 152.0.5, 157.0, 158.0, 148.0.2, 137.0, 155.0.1, 144.0.2, 154.0.1, 134.0
Layer	cipher suites differ
JA4 label	unlabeled

medium

2026-09-29

2026-10-28

Last 7 days (2 observations)

Distinct clients per day (last 30 days, peak 3/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

Protocol	`t (TLS over TCP)`
TLS version	`13`
SNI	`d (domain)`
Cipher count	`13`
Extension count	`11`
ALPN	`h1`
Ciphers	`1301, 1302, 1303, c009, c00a, c013, c014, c02b, c02c, c02f, c030, cca8, cca9`
Extensions	`0005, 000a, 000b, 000d, 0012, 0017, 002b, 0033, ff01`
Signature algorithms	`0804, 0403, 0807, 0805, 0806, 0401, 0501, 0601, 0503, 0603, 0201, 0203`
JA4_r	`t13d1311h1_1301,1302,1303,c009,c00a,c013,c014,c02b,c02c,c02f,c030,cca8,cca9_0005,000a,000b,000d,0012,0017,002b,0033,ff01_0804,0403,0807,0805,0806,0401,0501,0601,0503,0603,0201,0203`
JA4_o (sample)	`t13d1311h1_45672f90a73c_fe8fa1c5cc33`
JA4_ro (sample)	`t13d1311h1_c02b,c02f,c02c,c030,cca9,cca8,c009,c013,c00a,c014,1301,1302,1303_0000,000b,ff01,0017,0012,0005,000a,000d,0010,002b,0033_0804,0403,0807,0805,0806,0401,0501,0601,0503,0603,0201,0203`

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.

HTTP request (JA4H)

fingerprint	co-occurrences
`ge11nr040000_8391bea91fb6_000000000000_000000000000`	7
`ge11nr030000_cd680697de12_000000000000_000000000000`	4
`ge11nn030000_cd680697de12_000000000000_000000000000` Match?Exact match in Thumbprint's published controlled catalog captures: powershell 7.6.6, powershell 7.6.5, powershell 7.6.4, +11 more.The fingerprint page shows the full measured match list. More on the catalog.	1

TCP SYN (p0f)

fingerprint	co-occurrences
`4:119+9:0:1460:65535,8:mss,nop,ws,nop,nop,sok:df,id+:0`	5
`4:49+15:0:1460:65535,2:mss,sok,ts,nop,ws:df,id+:0`	2
`4:50+14:0:1460:65535,2:mss,sok,ts,nop,ws:df,id+:0`	2
`4:47+17:0:1460:65535,2:mss,sok,ts,nop,ws:df,id+:0`	1
`4:54+10:0:1460:65535,2:mss,sok,ts,nop,ws:df,id+:0`	1
`4:53+11:0:1360:65535,2:mss,sok,ts,nop,ws:df,id+:0`	1

TCP SYN (JA4T)

fingerprint	co-occurrences
`65535_2-4-8-1-3_1460_2`	6
`65535_2-1-3-1-1-4_1460_8`	5
`65535_2-4-8-1-3_1360_2`	1

User-Agent

fingerprint	co-occurrences
`Mozilla/5.0 (X11; Linux x86_64; rv:140.0) Gecko/20100101 Firefox/140.0`	7
`Go-http-client/1.1`	5

Country

fingerprint	co-occurrences
`US` · United States	6
`HK` · Hong Kong SAR China	5
`CA` · Canada	1

Network (ASN)

fingerprint	co-occurrences
`AS9269` · Hong Kong Broadband Network Ltd.	5
`AS203861` · Miteflux Technologies Ltd	4
`AS215540` · GLOBAL CONNECTIVITY SOLUTIONS LLP	1
`AS211273` · Cloud Software - FZCO	1
`AS215381` · ROCKHOSTER PRIVATE LIMITED	1

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.	7