JA4 t12d990500_e91dfaae0f87_7562623a49ec

t12d990500_e91dfaae0f87_7562623a49ec

Completed a TLS handshake but never an HTTP request, so no User-Agent was ever presented.

What this fingerprint encodes

Transport

TCP

TLS version

TLS 1.2

Server name

server name sent

Cipher suites offered

99

Extensions offered

5

ALPN

none offered

Same tool, different options

These 4 other fingerprints share this one's JA4_c — the extension and signature-algorithm hash. A client that keeps its extension set constant while varying its cipher list produces exactly this pattern, which is what a scanner iterating cipher suites looks like. A JA3 cannot show you this: its single MD5 collapses ciphers and extensions together, so every variation looks like an unrelated client.

• t12d880500_9d74d59be4ce_7562623a49ec
• t12d990500_039a0bf59e5c_7562623a49ec
• t12d990500_41a9ebd02c1f_7562623a49ec
• t12d990500_ecf6b0aa1042_7562623a49ec

The hello it was computed from

Recovered because the proxy now stores the pre-hash JA3 string alongside the digest. Every number below came out of this client's ClientHello; anything we cannot name in the IANA registry is shown as its raw value rather than guessed at.

Version

TLS 1.2

Cipher suites 117

• 1 (0x0001)
• 2 (0x0002)
• TLS_RSA_WITH_RC4_128_MD5
• TLS_RSA_WITH_RC4_128_SHA
• 7 (0x0007)
• 9 (0x0009)
• TLS_RSA_WITH_3DES_EDE_CBC_SHA
• 12 (0x000c)
• 13 (0x000d)
• 15 (0x000f)
• 16 (0x0010)
• 18 (0x0012)
• 19 (0x0013)
• 21 (0x0015)
• TLS_DHE_DSS_WITH_3DES_EDE_CBC_SHA
• 28 (0x001c)
• 29 (0x001d)
• TLS_RSA_WITH_AES_128_CBC_SHA
• 48 (0x0030)
• 49 (0x0031)
• 50 (0x0032)
• TLS_DHE_RSA_WITH_AES_128_CBC_SHA
• TLS_RSA_WITH_AES_256_CBC_SHA
• 54 (0x0036)
• 55 (0x0037)
• 56 (0x0038)
• TLS_DHE_RSA_WITH_AES_256_CBC_SHA
• 59 (0x003b)
• TLS_RSA_WITH_AES_128_CBC_SHA256
• TLS_RSA_WITH_AES_256_CBC_SHA256
• 62 (0x003e)
• 63 (0x003f)
• 64 (0x0040)
• 102 (0x0066)
• TLS_DHE_RSA_WITH_AES_128_CBC_SHA256
• 104 (0x0068)
• 105 (0x0069)
• 106 (0x006a)
• TLS_DHE_RSA_WITH_AES_256_CBC_SHA256
• TLS_RSA_WITH_SEED_CBC_SHA
• 151 (0x0097)
• 152 (0x0098)
• 153 (0x0099)
• TLS_DHE_RSA_WITH_SEED_CBC_SHA
• TLS_RSA_WITH_AES_128_GCM_SHA256
• TLS_RSA_WITH_AES_256_GCM_SHA384
• TLS_DHE_RSA_WITH_AES_128_GCM_SHA256
• TLS_DHE_RSA_WITH_AES_256_GCM_SHA384
• 160 (0x00a0)
• 161 (0x00a1)
• 162 (0x00a2)
• 163 (0x00a3)
• 164 (0x00a4)
• 165 (0x00a5)
• TLS_AES_128_GCM_SHA256
• TLS_AES_256_GCM_SHA384
• TLS_CHACHA20_POLY1305_SHA256
• TLS_AES_128_CCM_SHA256
• TLS_AES_128_CCM_8_SHA256
• 49153 (0xc001)
• 49154 (0xc002)
• 49155 (0xc003)
• 49156 (0xc004)
• 49157 (0xc005)
• 49158 (0xc006)
• TLS_ECDHE_ECDSA_WITH_RC4_128_SHA
• TLS_ECDHE_ECDSA_WITH_3DES_EDE_CBC_SHA
• TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA
• TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA
• 49163 (0xc00b)
• 49164 (0xc00c)
• 49165 (0xc00d)
• 49166 (0xc00e)
• 49167 (0xc00f)
• 49168 (0xc010)
• TLS_ECDHE_RSA_WITH_RC4_128_SHA
• TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA
• TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA
• TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA
• TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256
• TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA384
• 49189 (0xc025)
• 49190 (0xc026)
• TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256
• TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384
• 49193 (0xc029)
• 49194 (0xc02a)
• TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256
• TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384
• 49197 (0xc02d)
• 49198 (0xc02e)
• TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256
• TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384
• 49201 (0xc031)
• 49202 (0xc032)
• TLS_DHE_RSA_WITH_ARIA_128_GCM_SHA256
• TLS_DHE_RSA_WITH_ARIA_256_GCM_SHA384
• TLS_RSA_WITH_ARIA_128_GCM_SHA256
• TLS_RSA_WITH_ARIA_256_GCM_SHA384
• TLS_ECDHE_ECDSA_WITH_ARIA_128_GCM_SHA256
• TLS_ECDHE_ECDSA_WITH_ARIA_256_GCM_SHA384
• TLS_ECDHE_RSA_WITH_ARIA_128_GCM_SHA256
• TLS_ECDHE_RSA_WITH_ARIA_256_GCM_SHA384
• TLS_RSA_WITH_AES_128_CCM
• TLS_RSA_WITH_AES_256_CCM
• TLS_DHE_RSA_WITH_AES_128_CCM
• TLS_DHE_RSA_WITH_AES_256_CCM
• TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256
• TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256
• TLS_DHE_RSA_WITH_CHACHA20_POLY1305_SHA256
• 5815 (0x16b7)
• 5816 (0x16b8)
• 5817 (0x16b9)
• 5818 (0x16ba)
• 253 (0x00fd)
• 198 (0x00c6)
• 199 (0x00c7)

Extensions 5

• ec_point_formats
• supported_groups
• server_name
• signature_algorithms
• renegotiation_info

Named groups 38

• 1 (0x0001)
• 2 (0x0002)
• 3 (0x0003)
• 4 (0x0004)
• 5 (0x0005)
• 6 (0x0006)
• 7 (0x0007)
• 8 (0x0008)
• 9 (0x0009)
• 10 (0x000a)
• 11 (0x000b)
• 12 (0x000c)
• 13 (0x000d)
• 14 (0x000e)
• 15 (0x000f)
• 16 (0x0010)
• 17 (0x0011)
• 18 (0x0012)
• 19 (0x0013)
• 20 (0x0014)
• 21 (0x0015)
• 22 (0x0016)
• secp256r1
• secp384r1
• secp521r1
• 26 (0x001a)
• 27 (0x001b)
• 28 (0x001c)
• x25519
• x448
• 41 (0x0029)
• ffdhe2048
• ffdhe3072
• ffdhe4096
• 259 (0x0103)
• 260 (0x0104)
• 65281 (0xff01)
• 65282 (0xff02)

Point formats 1

• uncompressed

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Seen in live traffic

Connections

13

First seen

2026-09-17 13:53 UTC

Last seen

2026-09-17 14:19 UTC

Transport

TCP

This entry is an observation, not a policy decision. It is here because the edge saw it, not because anyone reviewed it, and it blocks nothing on its own. Only the curated tier drives classification and banning.