TLS ClientHello (JA4)

t13d1516h2_8daaf6152771_0c27189014cf

first seen 2026-06-19 18:56 · last seen 2026-10-31 00:10 · JSON

Matches controlled captures

Known clients driven through this site's own edge produced this exact fingerprint — measured truth, not inference. catalog →

firefox 158.0 · Ubuntu 24.04 · via geckodriver · ci — 1 session, last 2026-10-19 20:09 controlled
firefox 157.0.1 · macOS 26.6.2 · via geckodriver · ci — 1 session, last 2026-10-19 20:08 controlled
firefox 157.0 · Ubuntu 24.04 · via playwright · container — 1 session, last 2026-10-08 20:13 controlled
firefox 155.0.1 · macOS 26.6.2 · via geckodriver · ci — 1 session, last 2026-10-06 03:14 controlled
firefox 155.0 · Ubuntu 24.04 · via playwright · container — 2 sessions, last 2026-10-06 03:06 controlled
firefox 155.0.1 · macOS 15.7.9 · via geckodriver · ci — 2 sessions, last 2026-10-01 01:12 controlled
firefox 154.0.1 · macOS 15.7.9 · via geckodriver · ci — 1 session, last 2026-09-07 22:32 controlled
firefox 154.0 · Windows 10.0.26100.33296 · via geckodriver · ci — 4 sessions, last 2026-09-01 00:59 controlled
firefox 154.0 · Ubuntu 24.04 · via geckodriver · ci — 1 session, last 2026-09-01 00:58 controlled

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

t13d1516h2_8daaf6152771_0c27189014cf

Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) …

User-Agent claims Safari 26.1

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 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/26.1 Safari/605.1.15
Claimed version	26.1
Measured versions	26.5, 26.5.2, 26.6.1, 26.4, 26.6.2
Layer	cipher suites differ
JA4 label	unlabeled

medium

2026-10-03

Last 7 days (9 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	`15`
Extension count	`16`
ALPN	`h2`
Ciphers	`002f, 0035, 009c, 009d, 1301, 1302, 1303, c013, c014, c02b, c02c, c02f, c030, cca8, cca9`
Extensions	`0005, 000a, 000b, 000d, 0012, 0017, 001c, 0022, 0023, 002b, 002d, 0033, fe0d, ff01`
Signature algorithms	`0403, 0503, 0603, 0804, 0805, 0806, 0401, 0501, 0601, 0203, 0201`
JA4_r	`t13d1516h2_002f,0035,009c,009d,1301,1302,1303,c013,c014,c02b,c02c,c02f,c030,cca8,cca9_0005,000a,000b,000d,0012,0017,001c,0022,0023,002b,002d,0033,fe0d,ff01_0403,0503,0603,0804,0805,0806,0401,0501,0601,0203,0201`
JA4_o (sample)	`t13d1516h2_77608d807651_7dae7bcd3fe2`
JA4_ro (sample)	`t13d1516h2_1301,1303,1302,c02b,c02f,cca9,cca8,c02c,c030,c013,c014,009c,009d,002f,0035_0000,0017,ff01,000a,000b,0023,0010,0005,0022,0012,0033,002b,000d,002d,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
`ge20nr10enus_b3034183f430_000000000000_000000000000` Match?Exact match in Thumbprint's published controlled catalog captures: firefox 153.0, firefox 153.0.3, firefox 155.0.1, +27 more.The fingerprint page shows the full measured match list. More on the catalog.	12
`ge20nr11enus_187a9385d229_000000000000_000000000000`	8
`ge20nr11enus_1d88e8a431b9_000000000000_000000000000`	5
`ge20nr12enus_1204b4dfdccd_000000000000_000000000000`	4
`ge20nr12enus_979a40433f82_000000000000_000000000000`	3
`ge20nr11engb_187a9385d229_000000000000_000000000000`	3
`ge20nr12enus_a4e537ffe33a_000000000000_000000000000`	2
`ge20nn12enus_a72b71f519fc_000000000000_000000000000`	2
`ge20nr12enus_a72b71f519fc_000000000000_000000000000`	2
`ge20nr11enus_3901d4197baf_000000000000_000000000000`	2

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 155.0.1, +31 more.The fingerprint page shows the full measured match list. More on the catalog.	43
`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.	10
`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, +12 more.The fingerprint page shows the full measured match list. More on the catalog.	3
`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.	3
`1:65536;2:0;4:131072;5:16384\|12517377\|11:0:0:42\|m,p,a,s`	1
`1:65536;2:0;4:131072;5:16384\|12517377\|5:0:0:13\|m,p,a,s`	1
`1:65536;2:0;4:131072;5:16384\|12517377\|9:0:0:13\|m,p,a,s`	1

TCP SYN (p0f)

fingerprint	co-occurrences
`4:52+12:0:1460:mss*44,10:mss,sok,ts,nop,ws:df,id+:0`	5
`4:50+14:0:1452:mss*45,7:mss,sok,ts,nop,ws:df,id+:0`	4
`4:47+17:0:1460:65535,6:mss,nop,ws,nop,nop,ts,sok,eol+1:df,ecn:0`	3
`4:111+17:0:1452:65535,8:mss,nop,ws,nop,nop,sok:df,id+:0`	3
`6:46+18:0:1440:mss*45,10:mss,sok,ts,nop,ws:flow:0`	3
`4:50+14:0:1460:mss*44,10:mss,sok,ts,nop,ws:df,id+:0`	2
`4:51+13:0:1460:mss*44,10:mss,sok,ts,nop,ws:df,id+:0`	2
`4:47+17:0:1420:mss*44,7:mss,sok,ts,nop,ws:df,id+:0`	2
`4:55+9:0:1460:65535,9:mss,sok,ts,nop,ws:df,id+:0`	2
`6:49+15:0:1440:mss*45,10:mss,sok,ts,nop,ws:flow:0`	2

TCP SYN (JA4T)

fingerprint	co-occurrences
`64240_2-4-8-1-3_1460_10`	10
`64800_2-4-8-1-3_1440_10`	6
`64320_2-4-8-1-3_1340_10`	4
`65535_2-1-3-1-1-8-4-0-0_1440_6`	4
`65340_2-4-8-1-3_1452_7`	4
`65535_2-4-8-1-3_1460_9`	3
`65535_2-1-3-1-1-8-4-0-0_1460_6`	3
`65535_2-1-3-1-1-4_1452_8`	3
`65535_2-1-3-1-1-8-4-0-0_1452_6`	2
`65535_2-1-3-1-1-4_1432_8`	2

User-Agent

fingerprint	co-occurrences
`Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:157.0) Gecko/20100101 Firefox/157.0`	8
`Mozilla/5.0 (X11; Linux x86_64; rv:152.0) Gecko/20100101 Firefox/152.0`	7
`Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:155.0) Gecko/20100101 Firefox/155.0`	4
`Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:157.0) Gecko/20100101 Firefox/157.0`	4
`Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:158.0) Gecko/20100101 Firefox/158.0`	4
`Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:155.0) Gecko/20100101 Firefox/155.0`	3
`Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:157.0) Gecko/20100101 Firefox/157.0`	3
`Mozilla/5.0 (X11; Linux x86_64; rv:159.0) Gecko/20100101 Firefox/159.0`	3
`Mozilla/5.0 (X11; Linux x86_64; rv:150.0) Gecko/20100101 Firefox/150.0`	2
`Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:151.0) Gecko/20100101 Firefox/151.0`	2

Country

fingerprint	co-occurrences
`US` · United States	18
`ES` · Spain	5
`CA` · Canada	4
`BR` · Brazil	4
`RU` · Russia	4
`DE` · Germany	3
`CH` · Switzerland	3
`GB` · United Kingdom	3
`VN` · Vietnam	3
`AU` · Australia	2

Network (ASN)

fingerprint	co-occurrences
`AS3352` · TELEFONICA DE ESPANA S.A.U.	5
`AS212238` · Datacamp Limited	3
`AS701` · Verizon Business	3
`AS12271` · Charter Communications Inc	3
`AS11878` · tzulo, inc.	3
`AS7552` · Viettel Group	3
`AS9009` · M247 Europe SRL	2
`AS6730` · Sunrise GmbH	2
`AS7922` · Comcast Cable Communications, LLC	2
`AS136557` · Host Universal Pty Ltd	2

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.	16

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
`q13d0315h3_55b375c5d22e_dc5437974b47`	35
`q13d0315h3_55b375c5d22e_bb76f32061e3`	3

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 155.0.1, +31 more.The fingerprint page shows the full measured match list. More on the catalog.	43
`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.	10
`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, +12 more.The fingerprint page shows the full measured match list. More on the catalog.	3
`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.	3
`1:65536;2:0;4:131072;5:16384\|12517377\|11:0:0:42\|m,p,a,s`	1
`1:65536;2:0;4:131072;5:16384\|12517377\|5:0:0:13\|m,p,a,s`	1
`1:65536;2:0;4:131072;5:16384\|12517377\|9:0:0:13\|m,p,a,s`	1