I'm running some small ISP here and I own couple of IP ranges.

I have given a few public IP addresses to some of my customer and they are running mail servers on them. They have demanded me to add reverse DNS entries (`PTR`) for their IPs. 

I have Bind running on my server. Can I add multiple `PTR` records in same server/same file? 

IP range I own: `192.168.10.0/24` 

```
Customer A: 192.168.10.103  
Customer B: 192.168.10.199  
Customer C: 192.168.10.169  
Customer D: 192.168.10.69  

```

Thanks.