TLS ClientHello (JA4)

t13d181000_5d04281c6031_78e6aca7449b

first seen 2026-08-01 08:17 · last seen 2026-10-20 20:44 · 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

t13d181000_5d04281c6031_78e6aca7449b

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

User-Agent claims Chrome 154.0.0.0

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 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/154.0.0.0 Safari/537.36
Claimed version	154.0.0.0
Measured versions	149.0.7827.103, 149.0.7827.53, 149.0.7827.115, 153.0.8010.47, 149.0.7827.54, 155.0.8059.79, 153.0.8010.36, 151.0.7922.170, 156.0.8078.48, 152.0.7977.82, 152.0.7977.65, 156.0.8078.73, 156.0.8078.74, 155.0.8059.84, 150.0.7871.129, 155.0.8059.40, 154.0.8037.58, 151.0.7922.173, 149.0.7827.156, 151.0.7922.71, 150.0.7871.128, 154.0.8037.97, 149.0.7827.155, 151.0.7922.109, 152.0.7977.64, 156.0.8078.79, 149.0.7827.200, 151.0.7922.174, 153.0.8010.53, 149.0.7827.114, 154.0.8037.57, 149.0.7827.201, 150.0.7871.187, 152.0.7977.83, 153.0.8010.52, 150.0.7871.114, 155.0.8059.39, 150.0.7871.115, 151.0.7922.72, 151.0.7922.137, 152.0.7977.75, 154.0.8037.92, 156.0.8078.47, 149.0.7827.102, 151.0.7922.108, 150.0.7871.125, 150.0.7871.46, 148.0.7778.179
Layer	cipher suites differ
JA4 label	unlabeled

medium

2026-10-12

Distinct clients per day (last 30 days, peak 2/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	`18`
Extension count	`10`
ALPN	`00`
Ciphers	`002f, 0035, 009c, 009d, 1301, 1302, 1303, c009, c00a, c013, c014, c027, c02b, c02c, c02f, c030, cca8, cca9`
Extensions	`000a, 000b, 000d, 0017, 0023, 002b, 002d, 0033, ff01`
Signature algorithms	`0403, 0804, 0401, 0503, 0805, 0501, 0806, 0601, 0201`
JA4_r	`t13d181000_002f,0035,009c,009d,1301,1302,1303,c009,c00a,c013,c014,c027,c02b,c02c,c02f,c030,cca8,cca9_000a,000b,000d,0017,0023,002b,002d,0033,ff01_0403,0804,0401,0503,0805,0501,0806,0601,0201`
JA4_o (sample)	`t13d181000_04134bd58ce0_e926dfe0188b`
JA4_ro (sample)	`t13d181000_1301,1302,1303,c02f,c02b,c030,c02c,c027,cca9,cca8,c009,c013,c00a,c014,009c,009d,002f,0035_0000,0017,ff01,000a,000b,0023,000d,0033,002d,002b_0403,0804,0401,0503,0805,0501,0806,0601,0201`

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
`ge11nn050000_2469c960a647_000000000000_000000000000`	34
`ge11nn080000_886c0477bc6e_000000000000_000000000000`	2
`ge11nr150000_aa0ded6285c9_000000000000_000000000000`	2
`ge11nr18vi00_a772c8a1112f_000000000000_000000000000`	1
`ge11nn060000_87a4db4732ec_000000000000_000000000000`	1
`ge11nn050000_4f425be83c57_000000000000_000000000000`	1
`ge11nn060000_8064edffa6a6_000000000000_000000000000`	1

TCP SYN (p0f)

fingerprint	co-occurrences
`4:54+10:0:1460:mss*29,9:mss,sok,ts,nop,ws:df,id+:0`	3
`4:114+14:0:1460:65535,8:mss,nop,ws,nop,nop,sok:df,id+:0`	3
`4:112+16:0:1358:mss*44,8:mss,nop,ws,nop,nop,sok:df,id+:0`	3
`4:46+18:0:1460:mss*44,10:mss,sok,ts,nop,ws:df,id+:0`	2
`6:53+11:0:1440:65535,8:mss,nop,ws,nop,nop,sok:flow:0`	2
`6:48+16:0:1432:65535,8:mss,nop,ws,nop,nop,sok:flow:0`	2
`4:115+13:0:1460:65535,8:mss,nop,ws,nop,nop,sok:df,id+:0`	2
`4:119+9:0:1340:mss*48,8:mss,nop,ws,nop,nop,sok:df,id+:0`	2
`4:113+15:0:1358:mss*44,8:mss,nop,ws,nop,nop,sok:df,id+:0`	2
`4:52+12:0:1460:65535,9:mss,sok,ts,nop,ws:df,id+:0`	1

TCP SYN (JA4T)

fingerprint	co-occurrences
`65535_2-1-3-1-1-4_1460_8`	6
`64240_2-1-3-1-1-4_1358_8`	5
`42340_2-4-8-1-3_1460_9`	3
`65535_2-1-3-1-1-4_1432_8`	3
`64240_2-4-8-1-3_1460_10`	2
`64240_2-1-3-1-1-4_1460_8`	2
`65535_2-4-8-1-3_1460_9`	2
`65535_2-1-3-1-1-4_1440_8`	2
`65535_2-1-3-1-1-8-4-0-0_1452_6`	2
`64320_2-1-3-1-1-4_1340_8`	2

User-Agent

fingerprint	co-occurrences
`Claude-User (claude-code/2.1.237; +https://support.anthropic.com/)`	5
`Claude-User (claude-code/2.1.289; +https://support.anthropic.com/)`	5
`PostmanRuntime/7.51.1`	3
`Claude-User (claude-code/2.1.252; +https://support.anthropic.com/)`	3
`Claude-User (claude-code/2.1.281; +https://support.anthropic.com/)`	3
`Claude-User (claude-code/2.1.267; +https://support.anthropic.com/)`	2
`Claude-User (claude-code/2.1.266; +https://support.anthropic.com/)`	2
`Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/154.0.0.0 Safari/537.36`	2
`Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/142.0.0.0 Safari/537.36`	1
`Claude-User (claude-code/2.1.234; +https://support.anthropic.com/)`	1

Country

fingerprint	co-occurrences
`US` · United States	8
`NL` · Netherlands	5
`KZ` · Kazakhstan	4
`CN` · China	3
`LV` · Latvia	3
`BR` · Brazil	2
`GB` · United Kingdom	2
`SE` · Sweden	2
`FR` · France	2
`RU` · Russia	2

Network (ASN)

fingerprint	co-occurrences
`AS395092` · Shock Hosting LLC	5
`AS212238` · Datacamp Limited	4
`AS9198` · JSC Kazakhtelecom	4
`AS42532` · SIA VEESP	3
`AS4134` · CHINANET BACKBONE	2
`AS28573` · Claro NXT Telecomunicacoes Ltda	2
`AS2856` · British Telecommunications Limited	2
`AS11351` · Charter Communications Inc	2
`AS33363` · Charter Communications, Inc	2
`AS9009` · M247 Europe SRL	1

TLS supported groups

fingerprint	co-occurrences
`11ec,001d,0017,0018` Match?Exact match in Thumbprint's published controlled catalog captures: chrome 156.0.8078.48, edge 155.0.4283.62, chrome 156.0.8078.47, +11 more.The fingerprint page shows the full measured match list. More on the catalog.	5