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add dns notes

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Malin Freeborn 2023-07-08 17:38:18 +02:00
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---
title: "dns"
tags: [ "networking", "host" ]
---
| Record | Type | Example |
|:-----------:|:--------------------|:---------------------------------------|
| A Record | IPv4 Address | "$domain".com |
| AAAA Record | IPv4 Address | "$domain".com |
| CNAME | Alternative Address | "$domain".rs, "$subdomain.$domain".com |
| NS | Nameserver | ns1.fastname.com |
| MX | Email server | "$domain".com |
| TXT | Literally anything,including ownership of a domain | |
| | | |
Query a host with the `host` command.
```bash
host $domain.$tld
```
```bash
host $domain.$tld 9.9.9.9
```
> dmz.rs has address 77.105.27.232
> dmz.rs mail is handled by 10 kralizec.dmz.rs.
> dmz.rs mail is handled by 20 splint.rs.
This shows the MX record has a secondary handler, called splint.rs.
You can also add a specific nameserver:
Request a specific record type (`CNAME`, `TXT`, et c.):
```bash
torsocks host -T -t $RECORD_TYPE $domain
```
## Troubleshooting
The `host` command uses UDP.
You can change to TCP by using `host -T`.