The PTR records for all IP addresses in
ip  dnsbl  srv  tr PTR gi0-0-0-10.98.nr11.b003393-1.iad03.atlas.cogentco.com.
ip  dnsbl  srv  tr PTR mail.pcrm.org.
ip  dnsbl  srv  tr PTR gi0-0-0-12.agr11.iad03.atlas.cogentco.com.
ip  dnsbl  srv  tr PTR cogentco.com.
ip  dnsbl  srv  tr PTR pt-dns.cogentco.com.
ip  dnsbl  srv  tr PTR gi0-3-1-4.rcr21.iad03.atlas.cogentco.com.
ip  dnsbl  srv  tr PTR gi0-0-0-6.1835.nr11.b003393-1.iad03.atlas.cogentco.com.
ip  dnsbl  srv  tr PTR gi0-0-0-0.2136.nr21.b003393-1.iad03.atlas.cogentco.com.
ip  dnsbl  srv  tr PTR gi0-0-0-1.2772.nr11.b003393-1.iad03.atlas.cogentco.com.
ip  dnsbl  srv  tr PTR gi3-10.mag02.iad03.atlas.cogentco.com.
ip  dnsbl  srv  tr PTR fa0-6.na06.b003393-1.iad03.atlas.cogentco.com.
ip  dnsbl  srv  tr PTR te0-0-2-1.1351.nr13.b003393-1.iad03.atlas.cogentco.com.
ip  dnsbl  srv  tr PTR 38-100-128-66.dcaccess.net.
ip  dnsbl  srv  tr PTR 38-100-128-67.dcaccess.net.
ip  dnsbl  srv  tr PTR 38-100-128-68.dcaccess.net.
ip  dnsbl  srv  tr PTR 38-100-128-69.dcaccess.net.
ip  dnsbl  srv  tr PTR 38-100-128-70.dcaccess.net.
ip  dnsbl  srv  tr PTR 38-100-128-71.dcaccess.net.
ip  dnsbl  srv  tr PTR 38-100-128-72.dcaccess.net.
ip  dnsbl  srv  tr PTR 38-100-128-73.dcaccess.net.
ip  dnsbl  srv  tr PTR 38-100-128-74.dcaccess.net.
ip  dnsbl  srv  tr PTR 38-100-128-75.dcaccess.net.
ip  dnsbl  srv  tr PTR 38-100-128-76.dcaccess.net.
ip  dnsbl  srv  tr PTR 38-100-128-77.dcaccess.net.
ip  dnsbl  srv  tr PTR 38-100-128-78.dcaccess.net.
ip  dnsbl  srv  tr PTR fa0-7.na01.b003393-1.iad03.atlas.cogentco.com.
ip  dnsbl  srv  tr PTR gi0-0-0-16.219.agr11.iad03.atlas.cogentco.com.
ip  dnsbl  srv  tr PTR gi8-7.mpd01.iad03.atlas.cogentco.com.
ip  dnsbl  srv  tr PTR gi0-3-0-6.rcr21.iad03.atlas.cogentco.com.
ip  dnsbl  srv  tr PTR colo.weta.org.
ip  dnsbl  srv  tr PTR gi0-0-0-17.201.agr11.iad03.atlas.cogentco.com.
ip  dnsbl  srv  tr PTR live.dona.net.
ip  dnsbl  srv  tr PTR gi0-0-0-13.1882.nr11.b003393-1.iad03.atlas.cogentco.com.
33 out of 256 IP addresses in appear to have a PTR.

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