```bash
dnsrecon -d example.com -t std
```
- `-d`: domain name
- `-t`: type of enumeration to perform (in this case, a standard scan)
```bash
dnsrecon -d example.com -D list.txt -t brt
```
- `-D`: a file name containing potential subdomain strings
- `-t`: type of enumeration to perform
- `brt`: brute force