| CCA | Supported Congestion Control Algorithms | array | Which CCAs are supported by the QUIC library. |
| V2 | QUIC v2 Support | boolean | If the QUIC library supports QUICv2 (RFC9369). |
| GREASE | Greasing the QUIC Bit Support | boolean | If the QUIC library supports RFC9287. |
| DGRAM | Datagram Extension Support | boolean | If the QUIC library supports the unrealiable datagram extension (RFC9221). |
| H3 | HTTP/3 Integration | boolean | If the QUIC library integrates HTTP/3 on top of QUIC (RFC9114). |
| MP | Multipath Support | boolean | If the QUIC library supports the multipath extension. |
| ACKFREQ | ACK Frequency Support | boolean | If the QUIC library supports the ACK frequency extension. |
| TLSLIB | Used TLS Libraries | array | Which TLS libraries are used by the QUIC library. |
| ECH | Encrypted Client Hello Support | boolean | If the QUIC library supports Encrypted Client Hello. |