Supported Resource Record

README.md

@@ -4,6 +4,27 @@
 
 Resolv is a DNS resolver library written in Crystal.
 
+Supported Resource Record (RR) TYPEs [[RFC1035](https://www.rfc-editor.org/rfc/rfc1035.html)]:
+
+|    | Type   | Value | Meaning                                 |
+| -- | ------ | ----- | --------------------------------------- |
+| ✓ | `A`     | `1`  | a host address                           |
+| ✓ | `NS`    | `2`  | an authoritative name server             |
+|   | `MD`    | `3`  | a mail destination (Obsolete - use MX)   |
+|   | `MF`    | `4`  | a mail forwarder (Obsolete - use MX)     |
+| ✓ | `CNAME` | `5`  | the canonical name for an alias          |
+| ✓ | `SOA`   | `6`  | marks the start of a zone of authority   |
+|   | `MB`    | `7`  | a mailbox domain name (EXPERIMENTAL)     |
+|   | `MG`    | `8`  | a mail group member (EXPERIMENTAL)       |
+|   | `MR`    | `9`  | a mail rename domain name (EXPERIMENTAL) |
+|   | `NULL`  | `10` | a null RR (EXPERIMENTAL)                 |
+|   | `WKS`   | `11` | a well known service description         |
+| ✓ | `PTR`   | `12` | a domain name pointer                    |
+|   | `HINFO` | `13` | host information                         |
+|   | `MINFO` | `14` | mailbox or mail list information         |
+| ✓ | `MX`    | `15` | mail exchange                            |
+| ✓ | `TXT`   | `16` | text strings                             |
+
 ## Installation
 
 1. Add the dependency to your `shard.yml`: