The PTR records for all IP addresses in
ip  dnsbl  srv  tr PTR kln-sw1-4.crystal.in.ua.
ip  dnsbl  srv  tr PTR gw-cr-6-10G.crystal.in.ua.
ip  dnsbl  srv  tr PTR gw-cr1-10G.crystal.in.ua.
ip  dnsbl  srv  tr PTR gw-cr2-10G.crystal.in.ua.
ip  dnsbl  srv  tr PTR gw-cr3-10G.crystal.in.ua.
ip  dnsbl  srv  tr PTR gw-cr4-10G.crystal.in.ua.
ip  dnsbl  srv  tr PTR mx.crystal.in.ua.
ip  dnsbl  srv  tr PTR gw-dtel.crystal.in.ua.
ip  dnsbl  srv  tr PTR gw-srv2.crystal.in.ua.
ip  dnsbl  srv  tr PTR zbx3.crystal.in.ua.
ip  dnsbl  srv  tr PTR userside.crystal.in.ua.
ip  dnsbl  srv  tr PTR ns3.crystal.in.ua.
ip  dnsbl  srv  tr PTR asterisk.crystal.in.ua.
ip  dnsbl  srv  tr PTR cs.crystal.in.ua.
ip  dnsbl  srv  tr PTR www.crystal.in.ua.
ip  dnsbl  srv  tr PTR dude.crystal.in.ua.
ip  dnsbl  srv  tr PTR nodarch.crystal.in.ua.
ip  dnsbl  srv  tr PTR vcsa.crystal.in.ua.
ip  dnsbl  srv  tr PTR bxdev2.crystal.in.ua.
ip  dnsbl  srv  tr PTR kln-sw1-48-32468.crystal.in.ua.
ip  dnsbl  srv  tr PTR lankom-gw.crystal.in.ua.
21 out of 256 IP addresses in appear to have a PTR.

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