The PTR records for all IP addresses in
ip  dnsbl  srv  tr PTR border.sjc.arin.net.
ip  dnsbl  srv  tr PTR lb.sjc.arin.net.
ip  dnsbl  srv  tr PTR lb1.sjc.arin.net.
ip  dnsbl  srv  tr PTR lb2.sjc.arin.net.
ip  dnsbl  srv  tr PTR pop.sjc.arin.net.
ip  dnsbl  srv  tr PTR buildme2.sjc.arin.net.
ip  dnsbl  srv  tr PTR buildme3.sjc.arin.net.
ip  dnsbl  srv  tr PTR buildme4.sjc.arin.net.
ip  dnsbl  srv  tr PTR buildme5.sjc.arin.net.
ip  dnsbl  srv  tr PTR buildme6.sjc.arin.net.
ip  dnsbl  srv  tr PTR buildme7.sjc.arin.net.
ip  dnsbl  srv  tr PTR buildme8.sjc.arin.net.
ip  dnsbl  srv  tr PTR foremanp.sjc.arin.net.
ip  dnsbl  srv  tr PTR whois.arin.net.
ip  dnsbl  srv  tr PTR rwhois.arin.net.
ip  dnsbl  srv  tr PTR x.arin.net.
ip  dnsbl  srv  tr PTR r.sjc.arin.net.
ip  dnsbl  srv  tr PTR locsrv1.sjc.arin.net.
ip  dnsbl  srv  tr PTR locsrv2.sjc.arin.net.
ip  dnsbl  srv  tr PTR x1.sjc.arin.net.
ip  dnsbl  srv  tr PTR x2.sjc.arin.net.
ip  dnsbl  srv  tr PTR bucket.sjc.arin.net.
ip  dnsbl  srv  tr PTR a1.sjc.arin.net.
ip  dnsbl  srv  tr PTR a2.sjc.arin.net.
ip  dnsbl  srv  tr PTR ns2.arin.net.
ip  dnsbl  srv  tr PTR rr.arin.net.
ip  dnsbl  srv  tr PTR lists.arin.net.
ip  dnsbl  srv  tr PTR r1.sjc.arin.net.
ip  dnsbl  srv  tr PTR r2.sjc.arin.net.
ip  dnsbl  srv  tr PTR whoisrws1.sjc.arin.net.
ip  dnsbl  srv  tr PTR whoisrws2.sjc.arin.net.
ip  dnsbl  srv  tr PTR whoisrws3.sjc.arin.net.
ip  dnsbl  srv  tr PTR whoisrws4.sjc.arin.net.
ip  dnsbl  srv  tr PTR whoisrws5.sjc.arin.net.
ip  dnsbl  srv  tr PTR whoisrws6.sjc.arin.net.
ip  dnsbl  srv  tr PTR monitor.sjc.arin.net.
ip  dnsbl  srv  tr PTR rrdp.arin.net.
ip  dnsbl  srv  tr PTR rpki.arin.net.
ip  dnsbl  srv  tr PTR ftp.arin.net.
ip  dnsbl  srv  tr PTR logs.sjc.arin.net.
ip  dnsbl  srv  tr PTR rdap.arin.net.
ip  dnsbl  srv  tr PTR cp01.sjc.arin.net.
ip  dnsbl  srv  tr PTR foreman-dhcp-249.sjc.arin.net.
ip  dnsbl  srv  tr PTR foreman-dhcp-250.sjc.arin.net.
ip  dnsbl  srv  tr PTR foreman-dhcp-251.sjc.arin.net.
ip  dnsbl  srv  tr PTR foreman-dhcp-252.sjc.arin.net.
ip  dnsbl  srv  tr PTR foreman-dhcp-253.sjc.arin.net.
47 out of 256 IP addresses in appear to have a PTR.

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