TLS ClientHello (JA4)

t13d1312h1_f57a46bbacb6_ab7e3b40a677

first seen 2026-06-12 09:40 · last seen 2026-09-14 17:29 · 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

t13d1312h1_f57a46bbacb6_ab7e3b40a677

Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:149…

User-Agent claims Firefox 149.0

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; Win64; x64; rv:149.0) Gecko/20100101 Firefox/149.0
Claimed version	149.0
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

2026-06-28

2026-08-01

t13d1312h1_f57a46bbacb6_ab7e3b40a677

Mozilla/5.0 (Macintosh; Intel Mac OS X 15_7_5) A…

User-Agent claims Safari 26.0

TLS cipher list matches no measured Safari capture

The offered TLS cipher suites match no controlled capture of Safari. 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 (Macintosh; Intel Mac OS X 15_7_5) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/26.0 Safari/605.1.15
Claimed version	26.0
Measured versions	26.5, 26.5.2, 26.6.1, 26.4, 26.6.2
Layer	cipher suites differ
JA4 label	unlabeled

medium

2026-06-28

2026-08-01

t13d1312h1_f57a46bbacb6_ab7e3b40a677

Mozilla/5.0 (Macintosh; Intel Mac OS X 15.7; rv:…

User-Agent claims Firefox 149.0

TLS cipher list matches no measured Firefox capture

Full User-Agent	Mozilla/5.0 (Macintosh; Intel Mac OS X 15.7; rv:149.0) Gecko/20100101 Firefox/149.0
Claimed version	149.0
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

2026-08-01

Last 7 days (34 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	`12`
ALPN	`h1`
Ciphers	`1301, 1302, 1303, c009, c00a, c013, c014, 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	`t13d1312h1_1301,1302,1303,c009,c00a,c013,c014,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)	`t13d1312h1_45672f90a73c_1b1d6b47de61`
JA4_ro (sample)	`t13d1312h1_c02b,c02f,c02c,c030,cca9,cca8,c009,c013,c00a,c014,1301,1302,1303_0000,000b,ff01,0017,0012,0005,000a,000d,0032,0010,002b,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
`ge11nr05enus_900748f1e0f3_000000000000_000000000000`	47
`ge11nr040000_e1d2031bdfea_000000000000_000000000000`	42
`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.	27
`ge11nn040000_e1d2031bdfea_000000000000_000000000000`	23
`ge11nr030000_cd680697de12_000000000000_000000000000`	18
`ge11nr060000_48452b10c019_000000000000_000000000000`	11
`ge11nr070000_63605f79051a_000000000000_000000000000`	11
`ge11nr120000_793e633f1402_000000000000_000000000000`	10
`ge11nr150000_3985b49a45e4_000000000000_000000000000`	10
`ge11nr090000_ca88a1a82d6a_000000000000_000000000000`	10

TCP SYN (p0f)

fingerprint	co-occurrences
`4:56+8:0:1460:mss*29,11:mss,sok,ts,nop,ws:df,id+:0`	74
`4:54+10:0:1460:mss*29,9:mss,sok,ts,nop,ws:df,id+:0`	52
`4:55+9:0:1460:mss*29,9:mss,sok,ts,nop,ws:df,id+:0`	33
`4:50+14:0:1460:mss*29,11:mss,sok,ts,nop,ws:df,id+:0`	17
`4:49+15:0:1460:mss*44,7:mss,sok,ts,nop,ws:df,id+:0`	16
`6:47+17:0:1440:mss*45,7:mss,sok,ts,nop,ws:flow:0`	15
`4:55+9:0:1436:mss*44,7:mss,sok,ts,nop,ws:df,id+:0`	14
`6:57+7:0:1440:mss*45,7:mss,sok,ts,nop,ws:flow:0`	11
`4:56+8:0:1460:mss*29,12:mss,sok,ts,nop,ws:df,id+:0`	10
`4:53+11:0:1460:mss*44,7:mss,sok,ts,nop,ws:df,id+:0`	9

TCP SYN (JA4T)

fingerprint	co-occurrences
`42340_2-4-8-1-3_1460_11`	91
`42340_2-4-8-1-3_1460_9`	85
`64800_2-4-8-1-3_1440_7`	25
`64240_2-4-8-1-3_1460_7`	23
`42340_2-4-8-1-3_1460_12`	17
`64240_2-4-8-1-3_1436_7`	14
`42340_2-4-8-1-3_1460_13`	14
`65535_2-4-8-1-3_1460_12`	7
`5808_2-4-8-1-3_1452_4`	1

User-Agent

fingerprint	co-occurrences
`Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36`	128
`Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/147.0.0.0 Safari/537.36`	21
`Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/147.0.0.0 Safari/537.36`	18
`Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:149.0) Gecko/20100101 Firefox/149.0`	18
`Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/147.0.0.0 Safari/537.36 Edg/146.0.3856.109`	18
`Mozilla/5.0 (Macintosh; Intel Mac OS X 15_7_5) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/26.0 Safari/605.1.15`	18
`Mozilla/5.0 (Macintosh; Intel Mac OS X 15.7; rv:149.0) Gecko/20100101 Firefox/149.0`	17
`Mozilla/5.0 (Windows NT 10.0; Win64; x64) Chrome/120.0.0.0`	16
`WordPress/6.4.3`	15
`Mozilla/5.0 (Linux; Android 13; SM-S918B) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Mobile Safari/537.36`	10

Country

fingerprint	co-occurrences
`NL` · Netherlands	128
`US` · United States	105
`SE` · Sweden	54
`DE` · Germany	18
`GB` · United Kingdom	5
`VN` · Vietnam	1

Network (ASN)

fingerprint	co-occurrences
`AS48090` · TECHOFF SRV LIMITED	101
`AS203861` · Miteflux Technologies Ltd	54
`AS9009` · M247 Europe SRL	35
`AS150303` · SoloRDP	24
`AS142430` · DIGI VPS	21
`AS211693` · NolimitCloud s.r.o	18
`AS26277` · ServerPoint.com	14
`AS203363` · Kuroit Limited	13
`AS41608` · NextGenWebs, S.L.	12
`AS7203` · Leaseweb USA, Inc.	11