TLS ClientHello (JA4)

t13d181000_5d04281c6031_78e6aca7449b

first seen 2026-08-01 08:17 · last seen 2026-09-17 14:25 · JSON

Last 7 days (7 observations)

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

Protocolt (TLS over TCP)
TLS version13
SNId (domain)
Cipher count18
Extension count10
ALPN00
Ciphers002f, 0035, 009c, 009d, 1301, 1302, 1303, c009, c00a, c013, c014, c027, c02b, c02c, c02f, c030, cca8, cca9
Extensions000a, 000b, 000d, 0017, 0023, 002b, 002d, 0033, ff01
Signature algorithms0403, 0804, 0401, 0503, 0805, 0501, 0806, 0601, 0201
JA4_rt13d181000_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)

fingerprintco-occurrences
ge11nn050000_2469c960a647_000000000000_00000000000021
ge11nn080000_886c0477bc6e_000000000000_0000000000002
ge11nr18vi00_a772c8a1112f_000000000000_0000000000001
ge11nn060000_87a4db4732ec_000000000000_0000000000001
ge11nn050000_4f425be83c57_000000000000_0000000000001
ge11nn060000_8064edffa6a6_000000000000_0000000000001

TCP SYN (p0f)

fingerprintco-occurrences
4:114+14:0:1460:65535,8:mss,nop,ws,nop,nop,sok:df,id+:03
4:46+18:0:1460:mss*44,10:mss,sok,ts,nop,ws:df,id+:02
4:54+10:0:1460:mss*29,9:mss,sok,ts,nop,ws:df,id+:02
6:53+11:0:1440:65535,8:mss,nop,ws,nop,nop,sok:flow:02
4:115+13:0:1460:65535,8:mss,nop,ws,nop,nop,sok:df,id+:02
4:119+9:0:1340:mss*48,8:mss,nop,ws,nop,nop,sok:df,id+:02
4:55+9:0:1460:mss*44,7:mss,sok,ts,nop,ws:df,id+:01
4:44+20:0:1412:65535,6:mss,nop,ws,nop,nop,ts,sok,eol+1:df,ecn:01
4:113+15:0:1460:mss*44,8:mss,nop,ws,nop,nop,sok:df,id+:01
4:46+18:0:1452:65535,6:mss,nop,ws,nop,nop,ts,sok,eol+1:df,ecn:01

TCP SYN (JA4T)

fingerprintco-occurrences
65535_2-1-3-1-1-4_1460_85
64240_2-4-8-1-3_1460_102
64240_2-1-3-1-1-4_1460_82
65535_2-1-3-1-1-4_1440_82
42340_2-4-8-1-3_1460_92
65535_2-1-3-1-1-8-4-0-0_1452_62
64320_2-1-3-1-1-4_1340_82
64240_2-1-3-1-1-4_1452_82
64240_2-4-8-1-3_1460_71
65535_2-1-3-1-1-8-4-0-0_1440_61

User-Agent

fingerprintco-occurrences
Claude-User (claude-code/2.1.237; +https://support.anthropic.com/)5
PostmanRuntime/7.51.13
Claude-User (claude-code/2.1.252; +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 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/142.0.0.0 Safari/537.361
Claude-User (claude-code/2.1.234; +https://support.anthropic.com/)1
Claude-User (claude-code/2.1.241; +https://support.anthropic.com/)1
Claude-User (claude-code/2.1.245; +https://support.anthropic.com/)1
Claude-User (claude-code/2.1.247; +https://support.anthropic.com/)1

Country

fingerprintco-occurrences
US · United States4
KZ · Kazakhstan4
CN · China3
BR · Brazil2
SE · Sweden2
RU · Russia2
LV · Latvia2
JP · Japan1
CA · Canada1
FR · France1

Network (ASN)

fingerprintco-occurrences
AS9198 · JSC Kazakhtelecom4
AS212238 · Datacamp Limited2
AS4134 · CHINANET BACKBONE2
AS28573 · Claro NXT Telecomunicacoes Ltda2
AS11351 · Charter Communications Inc2
AS42532 · SIA VEESP2
AS12389 · PJSC Rostelecom1
AS20001 · Charter Communications Inc1
AS7552 · Viettel Group1
AS4812 · China Telecom (Group)1