TLS ClientHello (JA4)

t13d1516h3_8daaf6152771_d8a2da3f94cd

first seen 2026-06-22 06:16 · last seen 2026-09-16 06:36 · 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

t13d1516h3_8daaf6152771_d8a2da3f94cd

Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv…

User-Agent claims Firefox 155.0

TLS extensions or signature algorithms differ from every measured Firefox capture

The cipher suites match Firefox, but the extension set or signature algorithms differ from every capture even after normalizing handshake-variant extensions. Most likely a field-trial, ECH, or build variant the catalog has not captured; occasionally mimicry. This sharpens as catalog coverage grows.

Full User-Agent	Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:155.0) Gecko/20100101 Firefox/155.0
Claimed version	155.0
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 match; extension set or signature algorithms differ
JA4 label	unlabeled

low

2026-09-16

t13d1516h3_8daaf6152771_d8a2da3f94cd

Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:143…

User-Agent claims Firefox 143.0

TLS extensions or signature algorithms differ from every measured Firefox capture

Full User-Agent	Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:143.0) Gecko/20100101 Firefox/143.0
Claimed version	143.0
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 match; extension set or signature algorithms differ
JA4 label	unlabeled

low

2026-06-22

2026-09-12

Last 7 days (5 observations)

Distinct clients per day (last 30 days, peak 1/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	`h3`
Ciphers	`002f, 0035, 009c, 009d, 1301, 1302, 1303, c013, c014, c02b, c02c, c02f, c030, cca8, cca9`
Extensions	`0005, 000a, 000b, 000d, 0012, 0017, 001b, 0023, 002b, 002d, 0033, 44cd, fe0d, ff01`
Signature algorithms	`0403, 0804, 0401, 0503, 0805, 0501, 0806, 0601`
JA4_r	`t13d1516h3_002f,0035,009c,009d,1301,1302,1303,c013,c014,c02b,c02c,c02f,c030,cca8,cca9_0005,000a,000b,000d,0012,0017,001b,0023,002b,002d,0033,44cd,fe0d,ff01_0403,0804,0401,0503,0805,0501,0806,0601`
JA4_o (sample)	`t13d1516h3_acb858a92679_c9a199f912c1`
JA4_ro (sample)	`t13d1516h3_1301,1302,1303,c02b,c02f,c02c,c030,cca9,cca8,c013,c014,009c,009d,002f,0035_0023,000d,44cd,0033,0012,000b,002b,0005,0010,0000,fe0d,001b,000a,002d,0017,ff01_0403,0804,0401,0503,0805,0501,0806,0601`

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
`ge20nr13zhcn_50f953bbeac5_000000000000_000000000000`	3
`ge20nn030000_6dac75bd47eb_000000000000_000000000000` Match?Exact match in Thumbprint's published controlled catalog captures: python-httpx 0.28.1.The fingerprint page shows the full measured match list. More on the catalog.	3
`ge20nn030000_80b089f68b8e_000000000000_000000000000`	2
`ge20nr11engb_3901d4197baf_000000000000_000000000000`	2
`ge20nn14enus_00c893c2b404_000000000000_000000000000`	2
`ge20nn11engb_3901d4197baf_000000000000_000000000000`	2
`ge20nr12zhcn_ec42c49253c7_000000000000_000000000000`	1

HTTP/2 frames (Akamai)

fingerprint	co-occurrences
`1:65536;2:0;4:6291456;6:262144\|15663105\|1:1:0:256\|m,a,s,p` Match?Exact match in Thumbprint's published controlled catalog captures: chromium 131.0.6778.33, chromium 151.0.7922.34, chrome 151.0.7922.137, +43 more.The fingerprint page shows the full measured match list. More on the catalog.	15

TCP SYN (p0f)

fingerprint	co-occurrences
`4:47+17:0:1460:65535,6:mss,nop,ws,nop,nop,ts,sok,eol+1:df,ecn:0`	2
`4:44+20:0:1460:mss*20,7:mss,sok,ts,nop,ws:df,id+:0`	2
`4:48+16:0:1460:65535,6:mss,nop,ws,nop,nop,ts,sok,eol+1:df,ecn:0`	2
`4:115+13:0:1400:65535,8:mss,nop,ws,nop,nop,sok:df,id+:0`	2
`4:46+18:0:1460:mss*20,7:mss,sok,ts,nop,ws:df,id+:0`	1
`4:45+19:0:1460:mss*20,7:mss,sok,ts,nop,ws:df,id+:0`	1
`4:53+11:0:1460:mss*44,8:mss,sok,ts,nop,ws:df,id+:0`	1
`4:43+21:0:1380:65535,6:mss,nop,ws,nop,nop,ts,sok,eol+1:df,ecn:0`	1
`4:44+20:0:1380:65535,6:mss,nop,ws,nop,nop,ts,sok,eol+1:df,ecn:0`	1
`4:43+21:0:1400:65535,6:mss,nop,ws,nop,nop,ts,sok,eol+1:df,id+:0`	1

TCP SYN (JA4T)

fingerprint	co-occurrences
`65535_2-1-3-1-1-8-4-0-0_1460_6`	4
`65535_2-1-3-1-1-4_1400_8`	3
`65535_2-1-3-1-1-8-4-0-0_1380_6`	2
`29200_2-4-8-1-3_1460_7`	1
`64240_2-4-8-1-3_1460_8`	1
`65535_2-1-3-1-1-8-4-0-0_1400_6`	1

User-Agent

fingerprint	co-occurrences
`Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:155.0) Gecko/20100101 Firefox/155.0`	4
`Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36`	3
`Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:143.0) Gecko/20100101 Firefox/143.0`	2
`Mozilla/5.0 (Linux; Android 12; redroid12_arm64 Build/SQ1D.220205.004; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/122.0.6261.119 Mobile Safari/537.36 uni-app`	2
`Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/133.0.0.0 Safari/537.36`	2
`tcpfp/1`	2

Country

fingerprint	co-occurrences
`AU` · Australia	4
`CN` · China	4
`EG` · Egypt	3
`TR` · Turkey	2
`LB` · Lebanon	2

Network (ASN)

fingerprint	co-occurrences
`AS17638` · ASN for TIANJIN Provincial Net of CT	4
`AS1221` · Telstra Limited	4
`AS24863` · Link Egypt (Link.NET)	3
`AS9051` · IncoNet Data Management sal	2
`AS212238` · Datacamp Limited	1
`AS51801` · INTERNET KUTUSU TELEKOMUNIKASYON BILISIM HIZMETLERI SANAYI VE TICARET LIMITED SIRKETI	1