TLS ClientHello (JA4)

t13d521100_b262b3658495_8e6e362c5eac

first seen 2026-06-11 23:07 · last seen 2026-09-14 14:07 · 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

t13d521100_b262b3658495_8e6e362c5eac

Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:151…

User-Agent claims Firefox 151.0

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:151.0) Gecko/20100101 Firefox/151.0
Claimed version	151.0
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

2026-08-11

t13d521100_b262b3658495_8e6e362c5eac

Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleW…

User-Agent claims Chrome 148.0.7778.96

TLS cipher list matches no measured Chrome capture

The offered TLS cipher suites match no controlled capture of Chrome. 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) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/148.0.7778.96 Safari/537.36
Claimed version	148.0.7778.96
Measured versions	151.0.7922.174, 149.0.7827.103, 149.0.7827.53, 149.0.7827.115, 149.0.7827.114, 153.0.8010.47, 149.0.7827.54, 149.0.7827.201, 150.0.7871.187, 153.0.8010.36, 151.0.7922.170, 152.0.7977.83, 152.0.7977.82, 152.0.7977.65, 150.0.7871.114, 150.0.7871.115, 150.0.7871.129, 151.0.7922.72, 151.0.7922.137, 152.0.7977.75, 151.0.7922.173, 149.0.7827.102, 149.0.7827.156, 151.0.7922.71, 150.0.7871.128, 151.0.7922.108, 149.0.7827.155, 150.0.7871.125, 150.0.7871.46, 151.0.7922.109, 152.0.7977.64, 148.0.7778.179, 149.0.7827.200
Layer	cipher suites differ
JA4 label	unlabeled

medium

2026-07-15

Last 7 days (7 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	`52`
Extension count	`11`
ALPN	`00`
Ciphers	`002f, 0032, 0033, 0035, 0038, 0039, 003c, 003d, 0040, 0067, 006a, 006b, 009c, 009d, 009e, 009f, 00a2, 00a3, 1301, 1302, 1303, c009, c00a, c013, c014, c023, c024, c027, c028, c02b, c02c, c02f, c030, c050, c051, c052, c053, c056, c057, c05c, c05d, c060, c061, c09c, c09d, c09e, c09f, c0ac, c0ad, cca8, cca9, ccaa`
Extensions	`000a, 000b, 000d, 0016, 0017, 0023, 002b, 002d, 0033, ff01`
Signature algorithms	`0905, 0906, 0904, 0403, 0503, 0603, 0807, 0808, 081a, 081b, 081c, 0809, 080a, 080b, 0804, 0805, 0806, 0401, 0501, 0601, 0303, 0301, 0302, 0402, 0502, 0602`
JA4_r	`t13d521100_002f,0032,0033,0035,0038,0039,003c,003d,0040,0067,006a,006b,009c,009d,009e,009f,00a2,00a3,1301,1302,1303,c009,c00a,c013,c014,c023,c024,c027,c028,c02b,c02c,c02f,c030,c050,c051,c052,c053,c056,c057,c05c,c05d,c060,c061,c09c,c09d,c09e,c09f,c0ac,c0ad,cca8,cca9,ccaa_000a,000b,000d,0016,0017,0023,002b,002d,0033,ff01_0905,0906,0904,0403,0503,0603,0807,0808,081a,081b,081c,0809,080a,080b,0804,0805,0806,0401,0501,0601,0303,0301,0302,0402,0502,0602`
JA4_o (sample)	`t13d521100_ca35c0050d43_b609e078c809`
JA4_ro (sample)	`t13d521100_1302,1303,1301,c02f,c02b,c030,c02c,009e,c027,0067,c028,006b,00a3,009f,cca9,cca8,ccaa,c0ad,c09f,c05d,c061,c057,c053,00a2,c0ac,c09e,c05c,c060,c056,c052,c024,006a,c023,0040,c00a,c014,0039,0038,c009,c013,0033,0032,009d,c09d,c051,009c,c09c,c050,003d,003c,0035,002f_ff01,0000,000b,000a,0023,0016,0017,000d,002b,002d,0033_0905,0906,0904,0403,0503,0603,0807,0808,081a,081b,081c,0809,080a,080b,0804,0805,0806,0401,0501,0601,0303,0301,0302,0402,0502,0602`

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_2469c960a647_000000000000_000000000000`	31
`ge11nn05enus_e3dbea9fc70c_000000000000_000000000000`	4
`ge11nn07enus_71b742b5154a_000000000000_000000000000`	4
`ge11nn050000_09082fd1656c_000000000000_000000000000`	4
`ge11nn100000_3d340ab7ff9e_000000000000_000000000000`	3
`ge11nn090000_3f2cf9c1ec4d_000000000000_000000000000`	3
`ge11nn030000_b0d6a43aa599_000000000000_000000000000` Match?Exact match in Thumbprint's published controlled catalog captures: powershell 5.1.26100.33296, powershell 5.1.26100.33158, powershell 5.1.26100.32995.The fingerprint page shows the full measured match list. More on the catalog.	3
`he11nn05enus_107daf92ca44_000000000000_000000000000`	3
`ge11nn10ruru_170c1c30f240_000000000000_000000000000`	3
`ge11nn06enus_56dc0b380472_000000000000_000000000000`	2

TCP SYN (p0f)

fingerprint	co-occurrences
`4:51+13:0:1460:mss*44,7:mss,sok,ts,nop,ws:df,id+:0`	8
`6:42+22:0:1440:mss*45,7:mss,sok,ts,nop,ws:flow:0`	8
`6:41+23:0:1440:mss*45,7:mss,sok,ts,nop,ws:flow:0`	6
`4:54+10:0:1420:mss*46,7:mss,sok,ts,nop,ws:df,id+:0`	4
`4:54+10:0:1460:mss*44,7:mss,sok,ts,nop,ws:df,id+:0`	4
`4:45+19:0:1460:mss*44,7:mss,sok,ts,nop,ws:df,id+:0`	3
`4:57+7:0:1420:mss*46,7:mss,sok,ts,nop,ws:df,id+:0`	3
`6:43+21:0:1440:mss*45,7:mss,sok,ts,nop,ws:flow:0`	3
`4:46+18:0:1460:mss*44,7:mss,sok,ts,nop,ws:df,id+:0`	2
`4:46+18:0:1460:mss*20,7:mss,sok,ts,nop,ws:df,id+:0`	2

TCP SYN (JA4T)

fingerprint	co-occurrences
`64240_2-4-8-1-3_1460_7`	18
`64800_2-4-8-1-3_1440_7`	17
`62727_2-4-8-1-3_1460_7`	4
`65320_2-4-8-1-3_1420_7`	3
`65535_2-4-8-1-3_1460_9`	3
`64240_2-4-8-1-3_1460_10`	2
`29200_2-4-8-1-3_1460_7`	2
`65535_2-1-3-1-1-8-4-0-0_1460_6`	2
`65535_2-1-3-1-1-4_1460_8`	2
`42340_2-4-8-1-3_1460_11`	2

User-Agent

fingerprint	co-occurrences
`Mozilla/5.0`	24
`Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) HeadlessChrome/127.0.6533.0 Safari/537.36`	6
`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 DebugBear`	4
`Mozilla/5.0 (compatible; DomainScores/2.1; +https://www.domainscores.net/headers)`	4
`Mozilla/5.0 (compatible; The Lounge IRC Client; +https://github.com/thelounge/thelounge) facebookexternalhit/1.1 Twitterbot/1.0`	4
`Mozilla/5.0 (Linux; Android 11.0; moto g power (2022)) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/147.0.0.0 Mobile Safari/537.36 DebugBear`	3
`Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:151.0) Gecko/20100101 Firefox/151.0`	2
`axios/1.16.1`	2
`Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; LighthouseBot/1.2; +https://lighthouseapp.io/bot-info) Chrome/136.0.0.0 Safari/537.36`	2
`FudgeResearchBot/1.0 (+https://design.withfudge.com; simdi@withfudge.com)`	2

Country

fingerprint	co-occurrences
`IN` · India	24
`US` · United States	20
`FR` · France	7
`DE` · Germany	6
`RU` · Russia	4
`HU` · Hungary	4
`FI` · Finland	4
`ES` · Spain	2
`IE` · Ireland	2
`NZ` · New Zealand	2

Network (ASN)

fingerprint	co-occurrences
`AS47583` · Hostinger International Limited	24
`AS396982` · Google LLC	9
`AS24940` · Hetzner Online GmbH	6
`AS14618` · Amazon.com, Inc.	5
`AS16276` · OVH SAS	4
`AS62214` · Rackforest Zrt.	4
`AS16509` · Amazon.com, Inc.	3
`AS20473` · The Constant Company, LLC	3
`AS14593` · Space Exploration Technologies Corporation	2
`AS197540` · netcup GmbH	2