TLS ClientHello (JA4)

t13d1714h2_5b57614c22b0_53a6d0ab1c42

first seen 2026-06-17 10:20 · last seen 2026-08-10 02:09 · 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

t13d1714h2_5b57614c22b0_53a6d0ab1c42

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

User-Agent claims Firefox 140.0

TLS extensions or signature algorithms differ from every measured Firefox capture

The cipher suites match Firefox, but the extension set or signature algorithms differ from every capture even after normalizing handshake-variant extensions. Most likely a field-trial, ECH, or build variant the catalog has not captured; occasionally mimicry. This sharpens as catalog coverage grows.

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, 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 match; extension set or signature algorithms differ
JA4 label	unlabeled

low

2026-06-17

2026-08-10

t13d1714h2_5b57614c22b0_53a6d0ab1c42

Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:140…

User-Agent claims Firefox 140.0

TLS extensions or signature algorithms differ from every measured Firefox capture

Full User-Agent	Mozilla/5.0 (Windows NT 10.0; Win64; x64; 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 match; extension set or signature algorithms differ
JA4 label	unlabeled

low

2026-06-23

2026-07-06

t13d1714h2_5b57614c22b0_53a6d0ab1c42

Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:152…

User-Agent claims Firefox 152.0

TLS extensions or signature algorithms differ from every measured Firefox capture

Full User-Agent	Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:152.0) Gecko/20100101 Firefox/152.0
Claimed version	152.0
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 match; extension set or signature algorithms differ
JA4 label	unlabeled

low

2026-07-01

t13d1714h2_5b57614c22b0_53a6d0ab1c42

Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:147…

User-Agent claims Firefox 147.0

TLS extensions or signature algorithms differ from every measured Firefox capture

Full User-Agent	Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:147.0) Gecko/20100101 Firefox/147.0
Claimed version	147.0
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 match; extension set or signature algorithms differ
JA4 label	unlabeled

low

2026-06-29

t13d1714h2_5b57614c22b0_53a6d0ab1c42

Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:134…

User-Agent claims Firefox 134.0

TLS extensions or signature algorithms differ from every measured Firefox capture

Full User-Agent	Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:134.0) Gecko/20100101 Firefox/134.0
Claimed version	134.0
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 match; extension set or signature algorithms differ
JA4 label	unlabeled

low

2026-06-29

t13d1714h2_5b57614c22b0_53a6d0ab1c42

Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:146.0…

User-Agent claims Firefox 146.0

TLS extensions or signature algorithms differ from every measured Firefox capture

Full User-Agent	Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:146.0) Gecko/20100101 Firefox/146.0
Claimed version	146.0
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 match; extension set or signature algorithms differ
JA4 label	unlabeled

low

2026-07-14

Decomposed attributes

Protocol	`t (TLS over TCP)`
TLS version	`13`
SNI	`d (domain)`
Cipher count	`17`
Extension count	`14`
ALPN	`h2`
Ciphers	`002f, 0035, 009c, 009d, 1301, 1302, 1303, c009, c00a, c013, c014, c02b, c02c, c02f, c030, cca8, cca9`
Extensions	`0005, 000a, 000b, 000d, 0012, 0017, 001c, 0022, 002b, 0033, fe0d, ff01`
Signature algorithms	`0403, 0503, 0603, 0804, 0805, 0806, 0401, 0501, 0601, 0203, 0201`
JA4_r	`t13d1714h2_002f,0035,009c,009d,1301,1302,1303,c009,c00a,c013,c014,c02b,c02c,c02f,c030,cca8,cca9_0005,000a,000b,000d,0012,0017,001c,0022,002b,0033,fe0d,ff01_0403,0503,0603,0804,0805,0806,0401,0501,0601,0203,0201`
JA4_o (sample)	`t13d1714h2_5b234860e130_5457e2c43124`
JA4_ro (sample)	`t13d1714h2_1301,1303,1302,c02b,c02f,cca9,cca8,c02c,c030,c00a,c009,c013,c014,009c,009d,002f,0035_0000,0017,ff01,000a,000b,0010,0005,0022,0012,0033,002b,000d,001c,fe0d_0403,0503,0603,0804,0805,0806,0401,0501,0601,0203,0201`

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
`ge20nr11enus_187a9385d229_000000000000_000000000000`	12
`ge20nr12enus_a4e537ffe33a_000000000000_000000000000`	10
`ge20nr12enus_a72b71f519fc_000000000000_000000000000`	8
`ge20nn12enus_a72b71f519fc_000000000000_000000000000`	2
`ge20nr13enus_44e1f6d71293_000000000000_000000000000`	1

HTTP/2 frames (Akamai)

fingerprint	co-occurrences
`1:65536;2:0;4:131072;5:16384\|12517377\|3:0:0:22\|m,p,a,s` Match?Exact match in Thumbprint's published controlled catalog captures: firefox 153.0, firefox 153.0.3, firefox 154.0, +25 more.The fingerprint page shows the full measured match list. More on the catalog.	18
`1:65536;2:0;4:131072;5:16384\|12517377\|3:0:0:42\|m,p,a,s` Match?Exact match in Thumbprint's published controlled catalog captures: firefox 154.0, firefox 152.0.5, firefox 152.0.1, +3 more.The fingerprint page shows the full measured match list. More on the catalog.	4
`1:65536;2:0;4:131072;5:16384\|12517377\|5:0:0:22\|m,p,a,s` Match?Exact match in Thumbprint's published controlled catalog captures: firefox 153.0.3, firefox 154.0, firefox 153.0, +8 more.The fingerprint page shows the full measured match list. More on the catalog.	2
`1:65536;2:0;4:131072;5:16384\|12517377\|7:0:0:22\|m,p,a,s` Match?Exact match in Thumbprint's published controlled catalog captures: firefox 153.0.3, firefox 155.0, firefox 154.0, +3 more.The fingerprint page shows the full measured match list. More on the catalog.	2
`1:65536;2:0;4:131072;5:16384\|12517377\|11:0:0:42\|m,p,a,s`	2
`1:65536;2:0;4:131072;5:16384\|12517377\|13:0:0:42\|m,p,a,s`	2
`1:65536;2:0;4:131072;5:16384\|12517377\|9:0:0:42\|m,p,a,s`	1
`1:65536;2:0;4:131072;5:16384\|12517377\|17:0:0:42\|m,p,a,s`	1
`1:65536;2:0;4:131072;5:16384\|12517377\|19:0:0:42\|m,p,a,s`	1

TCP SYN (p0f)

fingerprint	co-occurrences
`4:54+10:0:1460:mss*44,10:mss,sok,ts,nop,ws:df,id+:0`	6
`4:55+9:0:1460:mss*44,10:mss,sok,ts,nop,ws:df,id+:0`	5
`4:112+16:0:1460:mss*44,8:mss,nop,ws,nop,nop,sok:df,id+:0`	4
`4:46+18:0:1460:mss*44,10:mss,sok,ts,nop,ws:df,id+:0`	3
`4:49+15:0:1460:mss*44,10:mss,sok,ts,nop,ws:df,id+:0`	3
`4:50+14:0:1460:mss*44,8:mss,nop,ws,nop,nop,sok:df,id+:0`	3
`4:51+13:0:1460:mss*44,10:mss,sok,ts,nop,ws:df,id+:0`	2
`4:45+19:0:1460:32768,10:mss,nop,ws,sok,ts::0`	2
`4:47+17:0:1460:mss*44,10:mss,sok,ts,nop,ws:df,id+:0`	1
`4:47+17:0:1460:mss*44,7:mss,sok,ts,nop,ws:df,id+:0`	1

TCP SYN (JA4T)

fingerprint	co-occurrences
`64240_2-4-8-1-3_1460_10`	14
`64240_2-1-3-1-1-4_1460_8`	7
`65520_2-4-8-1-3_1260_7`	1

User-Agent

fingerprint	co-occurrences
`Mozilla/5.0 (X11; Linux x86_64; rv:140.0) Gecko/20100101 Firefox/140.0`	22
`Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:140.0) Gecko/20100101 Firefox/140.0`	4
`Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:152.0) Gecko/20100101 Firefox/152.0`	4
`Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:147.0) Gecko/20100101 Firefox/147.0`	1
`Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:134.0) Gecko/20100101 Firefox/134.0`	1
`Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:146.0) Gecko/20100101 Firefox/146.0`	1

Country

fingerprint	co-occurrences
`CA` · Canada	12
`AU` · Australia	10
`US` · United States	4
`NL` · Netherlands	3
`NO` · Norway	1
`CH` · Switzerland	1
`BG` · Bulgaria	1
`IE` · Ireland	1

Network (ASN)

fingerprint	co-occurrences
`AS38195` · Superloop	10
`AS209854` · Cyberzone S.A.	9
`AS6128` · Cablevision Systems Corp.	4
`AS395965` · Carrytel	3
`AS215125` · Church of Cyberology	2
`AS50304` · Blix Solutions AS	1
`AS61125` · SABOTAGE LLC	1
`AS211507` · Julian Achter	1
`AS215540` · GLOBAL CONNECTIVITY SOLUTIONS LLP	1
`AS5466` · Eircom Limited	1

Cross-transport links

TLS ClientHello fingerprints observed from the same client via the beacon's correlation id on the other transport (e.g. this stack over TCP ↔ that stack over QUIC).

fingerprint	linked observations
`q13d0313h3_55b375c5d22e_fc7519ff7bc2`	9
`q13d0315h3_55b375c5d22e_dc5437974b47`	2
`q13d0314h3_55b375c5d22e_1ecea7cb6ec1`	1

fingerprint	co-occurrences
`1:65536;2:0;4:131072;5:16384\|12517377\|3:0:0:22\|m,p,a,s` Match?Exact match in Thumbprint's published controlled catalog captures: firefox 153.0, firefox 153.0.3, firefox 154.0, +25 more.The fingerprint page shows the full measured match list. More on the catalog.	18
`1:65536;2:0;4:131072;5:16384\|12517377\|3:0:0:42\|m,p,a,s` Match?Exact match in Thumbprint's published controlled catalog captures: firefox 154.0, firefox 152.0.5, firefox 152.0.1, +3 more.The fingerprint page shows the full measured match list. More on the catalog.	4
`1:65536;2:0;4:131072;5:16384\|12517377\|5:0:0:22\|m,p,a,s` Match?Exact match in Thumbprint's published controlled catalog captures: firefox 153.0.3, firefox 154.0, firefox 153.0, +8 more.The fingerprint page shows the full measured match list. More on the catalog.	2
`1:65536;2:0;4:131072;5:16384\|12517377\|7:0:0:22\|m,p,a,s` Match?Exact match in Thumbprint's published controlled catalog captures: firefox 153.0.3, firefox 155.0, firefox 154.0, +3 more.The fingerprint page shows the full measured match list. More on the catalog.	2
`1:65536;2:0;4:131072;5:16384\|12517377\|11:0:0:42\|m,p,a,s`	2
`1:65536;2:0;4:131072;5:16384\|12517377\|13:0:0:42\|m,p,a,s`	2
`1:65536;2:0;4:131072;5:16384\|12517377\|9:0:0:42\|m,p,a,s`	1
`1:65536;2:0;4:131072;5:16384\|12517377\|17:0:0:42\|m,p,a,s`	1
`1:65536;2:0;4:131072;5:16384\|12517377\|19:0:0:42\|m,p,a,s`	1