Tls Client Hello Inspector
Parse one plaintext ClientHello reassembled from TLS handshake records. Decode exact cipher IDs, SNI, ALPN, supported versions/groups, signature algorithms and key-share vectors; retain unknown extension bytes. No TLS connection, decryption, certificate/trust check or full negotiation validation. Reject duplicate extensions, inconsistent lengths and extra handshakes. 32 KiB text / 16 KiB binary / 16 records / 128 extensions / 32 key shares.
Enabling local controls…
Results
Review the settings and run. Editing inputs clears old results.
Processing model and limits
Parse one plaintext ClientHello reassembled from TLS handshake records. Decode exact cipher IDs, SNI, ALPN, supported versions/groups, signature algorithms and key-share vectors; retain unknown extension bytes. No TLS connection, decryption, certificate/trust check or full negotiation validation. Reject duplicate extensions, inconsistent lengths and extra handshakes. 32 KiB text / 16 KiB binary / 16 records / 128 extensions / 32 key shares.
Data and model checked: RFC 8446 ClientHello ↗Source tool controls ↗
How to use this tool
Load the example, confirm field units and processing rules, then run locally. Editing any input clears the old result. Copy or download the complete output explicitly.
When not to use it
Parse one plaintext ClientHello reassembled from TLS handshake records. Decode exact cipher IDs, SNI, ALPN, supported versions/groups, signature algorithms and key-share vectors; retain unknown extension bytes. No TLS connection, decryption, certificate/trust check or full negotiation validation. Reject duplicate extensions, inconsistent lengths and extra handshakes. 32 KiB text / 16 KiB binary / 16 records / 128 extensions / 32 key shares.