TLS ClientHello (JA4)

t12d290700_fc2078a0b8c0_8c06664c3ac5

first seen 2026-06-15 20:21 · last seen 2026-10-31 18:38 · JSON

Last 7 days (64 observations)

Distinct clients per day (last 30 days, peak 14/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	`12`
SNI	`d (domain)`
Cipher count	`29`
Extension count	`7`
ALPN	`00`
Ciphers	`000a, 002f, 0033, 0035, 0039, 003c, 003d, 0067, 006b, 009c, 009d, 009e, 009f, c009, c00a, c013, c014, c023, c024, c027, c028, c02b, c02c, c02f, c030, cc13, cc14, cca8, cca9`
Extensions	`000a, 000b, 000d, 0017, 0023, ff01`
Signature algorithms	`0601, 0603, 0501, 0503, 0401, 0403, 0201, 0203`
JA4_r	`t12d290700_000a,002f,0033,0035,0039,003c,003d,0067,006b,009c,009d,009e,009f,c009,c00a,c013,c014,c023,c024,c027,c028,c02b,c02c,c02f,c030,cc13,cc14,cca8,cca9_000a,000b,000d,0017,0023,ff01_0601,0603,0501,0503,0401,0403,0201,0203`
JA4_o (sample)	`t12d290700_a17167f2a10d_9add04999458`
JA4_ro (sample)	`t12d290700_c02b,c02f,009e,c02c,c030,009f,cca9,cca8,cc14,cc13,c009,c023,c013,c027,0033,0067,c00a,c024,c014,c028,0039,006b,009c,009d,002f,003c,0035,003d,000a_ff01,0000,0017,0023,000d,000b,000a_0601,0603,0501,0503,0401,0403,0201,0203`

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
`ge11nn040000_bfa5a9b89dd6_000000000000_000000000000`	407
`ge11nn05en00_61812dc1cc58_000000000000_000000000000`	274
`ge11nn06en00_3011d71998e2_000000000000_000000000000`	156
`ge11nn030000_dd98166e0881_000000000000_000000000000`	46
`ge11nn030000_341eb0d8946c_000000000000_000000000000`	13
`ge11nn05en00_e3dbea9fc70c_000000000000_000000000000`	7
`ge11nn040000_d368c19b6155_000000000000_000000000000`	6
`ge10nn030000_dd98166e0881_000000000000_000000000000`	1

TCP SYN (p0f)

fingerprint	co-occurrences
`6:49+15:0:1440:mss*45,7:mss,sok,ts,nop,ws:flow:0`	96
`6:49+15:0:1440:mss*45,10:mss,sok,ts,nop,ws:flow:0`	93
`4:45+19:0:1460:mss*44,7:mss,sok,ts,nop,ws::0`	62
`4:46+18:0:1460:65535,9:mss,nop,nop,sok,nop,ws::0`	57
`6:50+14:0:1440:mss*45,7:mss,sok,ts,nop,ws:flow:0`	55
`6:48+16:0:1440:mss*45,7:mss,sok,ts,nop,ws:flow:0`	52
`6:50+14:0:1440:mss*45,10:mss,sok,ts,nop,ws:flow:0`	52
`6:48+16:0:1440:mss*45,10:mss,sok,ts,nop,ws:flow:0`	50
`6:46+18:0:1440:mss*45,7:mss,sok,ts,nop,ws:flow:0`	49
`6:44+20:0:1440:mss*45,7:mss,sok,ts,nop,ws:flow:0`	28

TCP SYN (JA4T)

fingerprint	co-occurrences
`64800_2-4-8-1-3_1440_7`	311
`64800_2-4-8-1-3_1440_10`	197
`64240_2-4-8-1-3_1460_7`	119
`65535_2-1-1-4-1-3_1440_9`	73
`65535_2-1-1-4-1-3_1460_9`	57
`65535_2-4-8-1-3_1440_9`	30
`64240_2-4-8-1-3_1460_8`	20
`42340_2-1-1-4-1-3_1460_11`	20
`43200_2-1-1-4-1-3_1440_11`	13
`65535_2-4-8-1-3_1460_9`	12

User-Agent

fingerprint	co-occurrences
`Mozilla/5.0 (compatible; MJ12bot/v1.4.8; http://mj12bot.com/)`	910

Country

fingerprint	co-occurrences
`FR` · France	623
`FI` · Finland	102
`DE` · Germany	59
`NO` · Norway	49
`UA` · Ukraine	30
`PL` · Poland	23
`SG` · Singapore	9
`HK` · Hong Kong SAR China	8
`SE` · Sweden	4
`AT` · Austria	3

Network (ASN)

fingerprint	co-occurrences
`AS16276` · OVH SAS	585
`AS24940` · Hetzner Online GmbH	114
`AS51167` · Contabo GmbH	61
`AS29695` · Lyse Tele AS	37
`AS197540` · netcup GmbH	33
`AS48230` · LLC MONOLITH.NET	17
`AS2119` · Telenor Norge AS	12
`AS6939` · Hurricane Electric LLC	9
`AS4760` · HKT Limited	8
`AS13188` · CONTENT DELIVERY NETWORK LTD	8

TLS supported groups

fingerprint	co-occurrences
`001d,0017,0018` Match?Exact match in Thumbprint's published controlled catalog captures: rust-reqwest 0.12.28, rust-reqwest 0.11.27, powershell 7.6.8, +1 more.The fingerprint page shows the full measured match list. More on the catalog.	64