TLS ClientHello (JA4)

t12i130500_2d7513195f68_e51b7354d87f

first seen 2026-06-11 00:08 · last seen 2026-09-16 17:57 · 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

t12i130500_2d7513195f68_e51b7354d87f

Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:142.0…

User-Agent claims Firefox 142.0

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; Ubuntu; Linux x86_64; rv:142.0) Gecko/20100101 Firefox/142.0
Claimed version	142.0
Measured versions	146.0.1, 152.0.1, 154.0, 140.0.2, 151.0.4, 151.0.2, 139.0, 153.0.1, 155.0, 152.0.5, 153.0.3, 142.0.1, 153.0.4, 152.0.6, 150.0.2, 135.0, 132.0, 152.0.3, 148.0.2, 137.0, 141.0, 155.0.1, 153.0, 151.0.3, 144.0.2, 154.0.1, 134.0, 152.0.4, 151.0
Layer	cipher suites differ
JA4 label	unlabeled

medium

2026-06-12

t12i130500_2d7513195f68_e51b7354d87f

Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv…

User-Agent claims Firefox 140.0

TLS cipher list matches no measured Firefox capture

Full User-Agent	Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:140.0) Gecko/20100101 Firefox/140.0
Claimed version	140.0
Measured versions	146.0.1, 152.0.1, 154.0, 140.0.2, 151.0.4, 151.0.2, 139.0, 153.0.1, 155.0, 152.0.5, 153.0.3, 142.0.1, 153.0.4, 152.0.6, 150.0.2, 135.0, 132.0, 152.0.3, 148.0.2, 137.0, 141.0, 155.0.1, 153.0, 151.0.3, 144.0.2, 154.0.1, 134.0, 152.0.4, 151.0
Layer	cipher suites differ
JA4 label	unlabeled

medium

2026-06-12

t12i130500_2d7513195f68_e51b7354d87f

Mozilla/5.0 (X11; Linux x86_64; rv:142.0) Gecko/…

User-Agent claims Firefox 142.0

TLS cipher list matches no measured Firefox capture

Full User-Agent	Mozilla/5.0 (X11; Linux x86_64; rv:142.0) Gecko/20100101 Firefox/142.0
Claimed version	142.0
Measured versions	146.0.1, 152.0.1, 154.0, 140.0.2, 151.0.4, 151.0.2, 139.0, 153.0.1, 155.0, 152.0.5, 153.0.3, 142.0.1, 153.0.4, 152.0.6, 150.0.2, 135.0, 132.0, 152.0.3, 148.0.2, 137.0, 141.0, 155.0.1, 153.0, 151.0.3, 144.0.2, 154.0.1, 134.0, 152.0.4, 151.0
Layer	cipher suites differ
JA4 label	unlabeled

medium

2026-06-13

Last 7 days (133 observations)

Distinct clients per day (last 30 days, peak 24/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	`12`
SNI	`i (no SNI / IP)`
Cipher count	`13`
Extension count	`5`
ALPN	`00`
Ciphers	`0005, 000a, 002f, 0035, c007, c009, c00a, c011, c012, c013, c014, c02b, c02f`
Extensions	`0005, 000a, 000b, 000d, ff01`
Signature algorithms	`0401, 0403, 0201, 0203, 0401, 0501, 0601`
JA4_r	`t12i130500_0005,000a,002f,0035,c007,c009,c00a,c011,c012,c013,c014,c02b,c02f_0005,000a,000b,000d,ff01_0401,0403,0201,0203,0401,0501,0601`
JA4_o (sample)	`t12i130500_34ca9fd7c513_e51b7354d87f`
JA4_ro (sample)	`t12i130500_c02f,c02b,c011,c007,c013,c009,c014,c00a,0005,002f,0035,c012,000a_0005,000a,000b,000d,ff01_0401,0403,0201,0203,0401,0501,0601`

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_e1d2031bdfea_000000000000_000000000000`	2170
`ge11nr040000_88d30a62b7ad_000000000000_000000000000`	219
`ge11nn040000_88d30a62b7ad_000000000000_000000000000` Match?Exact match in Thumbprint's published controlled catalog captures: wget 1.25.0.The fingerprint page shows the full measured match list. More on the catalog.	34
`ge11nn060000_8130b97084e5_000000000000_000000000000`	1

TCP SYN (p0f)

fingerprint	co-occurrences
`6:51+13:0:8440:mss*7,0:mss,sok,ts:flow:0`	807
`6:48+16:0:8440:mss*7,0:mss,sok,ts:flow:0`	617
`6:52+12:0:8440:mss*7,0:mss,sok,ts:flow:0`	251
`6:53+11:0:8440:mss*7,0:mss,sok,ts:flow:0`	124
`4:53+11:0:1460:mss*44,0:mss,sok,ts:df,id+:0`	97
`6:54+10:0:8440:mss*7,0:mss,sok,ts:flow:0`	73
`4:49+15:0:1460:mss*44,0:mss,sok,ts:df,id+:0`	72
`4:52+12:0:1460:mss*44,0:mss,sok,ts:df,id+:0`	68
`6:49+15:0:8440:mss*7,0:mss,sok,ts:flow:0`	68
`6:47+17:0:8440:mss*7,0:mss,sok,ts:flow:0`	56

TCP SYN (JA4T)

fingerprint	co-occurrences
`59080_2-4-8_8440_00`	1909
`64240_2-4-8_1460_00`	235
`64800_2-4-8_1440_00`	7
`64240_2-4-8-1-3_1460_7`	3

User-Agent

fingerprint	co-occurrences
`Mozilla/5.0 (Macintosh; Intel Mac OS X 13_1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/108.0.0.0 Safari/537.36`	2399
`Mozilla/5.0 zgrab/0.x`	13
`Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/63.0.3239.132 Safari/537.36 QIHU 360SE`	4
`Mozilla/5.0 (Windows NT 10.0; rv:108.0) Gecko/20100101 Firefox/108.0`	1
`Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/109.0.0.0 Safari/537.36`	1
`Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0.0.0 Safari/537.36 Edg/124.0.0.0`	1
`Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:142.0) Gecko/20100101 Firefox/142.0`	1
`Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/113.0.0.0 Safari/537.36`	1
`Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:140.0) Gecko/20100101 Firefox/140.0`	1
`Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/99.0.4844.84 Safari/537.36`	1

Country

fingerprint	co-occurrences
`US` · United States	2420
`HK` · Hong Kong SAR China	4

Network (ASN)

fingerprint	co-occurrences
`AS63949` · Akamai Connected Cloud	2399
`AS8075` · Microsoft Corporation	10
`AS6939` · Hurricane Electric LLC	8
`AS137951` · ASLINE LIMITED	4
`AS402226` · OnlyScans LLC	3