TLS ClientHello (JA4)

t13d251100_b78ed14e2fd0_ab7e3b40a677

first seen 2026-06-11 09:39 · last seen 2026-09-16 03:55 · 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

t13d251100_b78ed14e2fd0_ab7e3b40a677

Mozilla/5.0 (Windows NT 10.0; rv:140.0) Gecko/20…

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 (Windows NT 10.0; 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

2026-06-11

Last 7 days (18 observations)

Distinct clients per day (last 30 days, peak 4/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	`25`
Extension count	`11`
ALPN	`00`
Ciphers	`0005, 000a, 002f, 0035, 003c, 009c, 009d, 1301, 1302, 1303, c007, c009, c00a, c011, c012, c013, c014, c023, c027, c02b, c02c, c02f, c030, cca8, cca9`
Extensions	`0005, 000a, 000b, 000d, 0012, 0017, 002b, 0032, 0033, ff01`
Signature algorithms	`0804, 0403, 0807, 0805, 0806, 0401, 0501, 0601, 0503, 0603`
JA4_r	`t13d251100_0005,000a,002f,0035,003c,009c,009d,1301,1302,1303,c007,c009,c00a,c011,c012,c013,c014,c023,c027,c02b,c02c,c02f,c030,cca8,cca9_0005,000a,000b,000d,0012,0017,002b,0032,0033,ff01_0804,0403,0807,0805,0806,0401,0501,0601,0503,0603`
JA4_o (sample)	`t13d251100_589d5112dc05_0a6381ba93d6`
JA4_ro (sample)	`t13d251100_c02b,c02f,c02c,c030,cca9,cca8,c009,c013,c00a,c014,009c,009d,002f,0035,c012,000a,c023,c027,003c,c007,c011,0005,1301,1302,1303_0000,000b,ff01,0017,0012,0005,000a,000d,0032,002b,0033_0804,0403,0807,0805,0806,0401,0501,0601,0503,0603`

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
`ge11nn050000_57c5e92682a8_000000000000_000000000000`	36
`ge11nn030000_0db47b7d240d_000000000000_000000000000`	25
`po11nn050000_b4ba55311b46_000000000000_000000000000`	22
`ge11nr050000_57c5e92682a8_000000000000_000000000000`	20
`ge11nn070000_ae5913c5f5ca_000000000000_000000000000`	11
`ge11nn040000_209bf58f7e8c_000000000000_000000000000`	6
`ge11nn05en00_813e32c09d15_000000000000_000000000000`	5
`ge11nr05en00_f3bb7aa45ec4_000000000000_000000000000`	5
`po11nn080000_4e91bb52a450_000000000000_000000000000`	5
`ge11nr070000_ae5913c5f5ca_000000000000_000000000000`	4

TCP SYN (p0f)

fingerprint	co-occurrences
`4:48+16:0:1460:mss*44,7:mss,sok,ts,nop,ws:df,id+:0`	34
`4:56+8:0:1460:mss*29,12:mss,sok,ts,nop,ws:df,id+:0`	26
`4:47+17:0:1460:mss*44,7:mss,sok,ts,nop,ws:df,id+:0`	17
`4:45+19:0:1460:mss*44,7:mss,sok,ts,nop,ws:df,id+:0`	11
`4:50+14:0:1460:mss*29,12:mss,sok,ts,nop,ws:df,id+:0`	7
`4:50+14:0:1460:mss*44,7:mss,sok,ts,nop,ws:df,id+:0`	6
`4:56+8:0:1460:mss*44,7:mss,sok,ts,nop,ws:df,id+:0`	6
`4:55+9:0:1460:mss*44,7:mss,sok,ts,nop,ws:df,id+:0`	5
`4:40+24:0:1460:mss*44,7:mss,sok,ts,nop,ws:df,id+:0`	3
`4:52+12:0:1460:mss*44,7:mss,sok,ts,nop,ws:df,id+:0`	3

TCP SYN (JA4T)

fingerprint	co-occurrences
`42340_2-4-8-1-3_1460_12`	33
`64240_2-4-8-1-3_1460_7`	32
`64800_2-4-8-1-3_1440_7`	5
`8192_2-1-3-1-1-4_1440_8`	4
`64320_2-4-8-1-3_1340_7`	4
`64240_2-4-8-1-3_1460_10`	2
`64240_2-4-8-1-3_1436_7`	2
`64240_2-1-3-1-1-4_1460_8`	2
`29200_2-4-8-1-3_1460_7`	1
`42340_2-4-8-1-3_1460_9`	1

User-Agent

fingerprint	co-occurrences
`RootEvidence/1.0`	15
`Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.1.1 Safari/605.1.15`	2
`Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/123.0.0.0 Safari/537.36`	2
`Mozilla/5.0 (Kubuntu; Linux i686) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/141.0.0.0 Safari/537.36`	2
`Mozilla/5.0 (ZZ; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/129.0.0.0 Safari/537.36`	2
`Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/13.1 Safari/605.1.15`	2
`Mozilla/5.0 (X11; Linux i686; rv:1.9.5.20) Gecko/ Firefox/3.6.20`	2
`Mozilla/5.0 (ZZ; Linux i686) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/133.0.0.0 Safari/537.36`	2
`Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_6) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/15.5 Mobile/15E148 Safari/604.1`	2
`Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/15.4 Safari/605.1.15`	2

Country

fingerprint	co-occurrences
`ID` · Indonesia	62
`NL` · Netherlands	41
`US` · United States	24
`DE` · Germany	12
`FR` · France	8
`PL` · Poland	3
`SG` · Singapore	2
`CN` · China	2
`LT` · Lithuania	2
`RO` · Romania	1

Network (ASN)

fingerprint	co-occurrences
`AS55688` · PT. Beon Intermedia	60
`AS48090` · TECHOFF SRV LIMITED	36
`AS10439` · CariNet, Inc.	11
`AS202412` · Omegatech LTD	7
`AS63949` · Akamai Connected Cloud	4
`AS8075` · Microsoft Corporation	4
`AS16276` · OVH SAS	4
`AS215599` · Zkillu SAS	4
`AS9009` · M247 Europe SRL	3
`AS51167` · Contabo GmbH	3