Hello, I have a 1MBps Leased Line here in Greece, and my ISP has gave me a 128 IP range (126 usuable IPs). I asked them to setup Reverse DNS Delegation to 2 nameservers of my domain, that are hosted on a VPS (lets say ns1.mydomain.com and ns2.mydomain.com) My VPS uses Plesk 7.1.6 on Virtuozzo. What I want is to setup PTR records for every IP from the IP Range of my ISP, so that when I tracert to a computer that uses any of those IPs, I get a host that uses my domain eg. webserver.mydomain.com or wintech2003.mydomain.com Again, ISP -> Gives me 128 IPs -> Set's up reverse dns delegation to ns1.mydomain.com and ns2.mydomain.com for my IP range. mydomain.com -> Is hosted outside the above IP range -> I have access to DNS settings via Plesk What I want is to create PTR records for ISPs IP Range with mydomain.com host. So my problem is that I'm a bit confused with the /8 , /16 /28 setting when I try to add a PTR from within Plesk. What do those numbers mean in Plesk? And what should I set it to? I want to create one PTR for each IP.. so shouldn't I normally use /32 ? But there's no /32 setting.... Also, I suppose I have to create a A record for each host also, don't I? Can anydoby briefly explain to me the way to set this up?