The PTR records for all IP addresses in
ip  dnsbl  srv  tr PTR vrrp-vl4050-ur21-ur22.westchester.pa.bo.comcast.net.
ip  dnsbl  srv  tr PTR be-50-4050-ur21-d.westchester.pa.bo.comcast.net.
ip  dnsbl  srv  tr PTR be-50-4050-ur22-d.westchester.pa.bo.comcast.net.
ip  dnsbl  srv  tr PTR ssl101-d-ve4050.westchester.pa.bo.comcast.net.
ip  dnsbl  srv  tr PTR ssl102-d-ve4050.westchester.pa.bo.comcast.net.
ip  dnsbl  srv  tr PTR compat.xapi.wcdc.int.xfinity.com.
ip  dnsbl  srv  tr PTR preview.customer.wcdc.int.xfinity.com.
ip  dnsbl  srv  tr PTR preview.www.wcdc.stg.xfinity.com.
ip  dnsbl  srv  tr PTR preview.xapi.wcdc.prd.xfinity.com.
ip  dnsbl  srv  tr PTR services.wcdc.prd.xfinity.com.
ip  dnsbl  srv  tr PTR www-buy.wcdc.int.xfinity.com.
ip  dnsbl  srv  tr PTR www-buy.wcdc.stg.xfinity.com.
ip  dnsbl  srv  tr PTR www-buy.wcdc.prd.xfinity.com.
ip  dnsbl  srv  tr PTR www-omni.wcdc.int.xfinity.com.
ip  dnsbl  srv  tr PTR www-omni.wcdc.stg.xfinity.com.
ip  dnsbl  srv  tr PTR www-omni.wcdc.prd.xfinity.com.
ip  dnsbl  srv  tr PTR www-support.wcdc.int.xfinity.com.
ip  dnsbl  srv  tr PTR www-support.wcdc.stg.xfinity.com.
ip  dnsbl  srv  tr PTR www-support.wcdc.prd.xfinity.com.
ip  dnsbl  srv  tr PTR business-commyacct.wcdc.int.xfinity.com.
ip  dnsbl  srv  tr PTR business-commyacct.wcdc.stg.xfinity.com.
ip  dnsbl  srv  tr PTR business-commyacct.wcdc.prd.xfinity.com.
ip  dnsbl  srv  tr PTR business-comhelp.wcdc.int.xfinity.com.
ip  dnsbl  srv  tr PTR business-comhelp.wcdc.stg.xfinity.com.
ip  dnsbl  srv  tr PTR business-comhelp.wcdc.prd.xfinity.com.
ip  dnsbl  srv  tr PTR prodtest.services.wcdc.int.xfinity.com.
ip  dnsbl  srv  tr PTR compat-services.wcdc.int.xfinity.com.
ip  dnsbl  srv  tr PTR business-sdwan.wcdc.int.xfinity.com.
ip  dnsbl  srv  tr PTR business-sdwan.wcdc.stg.xfinity.com.
ip  dnsbl  srv  tr PTR business-sdwan.wcdc.prd.xfinity.com.
ip  dnsbl  srv  tr PTR idx8.wcdc.int.xfinity.com.
ip  dnsbl  srv  tr PTR idx8.wcdc.stg.xfinity.com.
ip  dnsbl  srv  tr PTR activecore.wcdc.int.comcast.com.
ip  dnsbl  srv  tr PTR activecore.wcdc.stg.comcast.com.
ip  dnsbl  srv  tr PTR activecore.wcdc.prd.comcast.com.
ip  dnsbl  srv  tr PTR business-voice.wcdc.int.comcast.com.
ip  dnsbl  srv  tr PTR business-voice.wcdc.stg.comcast.com.
ip  dnsbl  srv  tr PTR business-voice.wcdc.prd.comcast.com.
ip  dnsbl  srv  tr PTR business-voicebve.wcdc.int.comcast.com.
ip  dnsbl  srv  tr PTR business-voicebve.wcdc.stg.comcast.com.
ip  dnsbl  srv  tr PTR business-voicebve.wcdc.prd.comcast.com.
ip  dnsbl  srv  tr PTR vl29.westchester.pa.bo.comcast.net.
ip  dnsbl  srv  tr PTR be-21-22-ur21-d.westchester.pa.bo.comcast.net.
ip  dnsbl  srv  tr PTR be-21-22-ur22-d.westchester.pa.bo.comcast.net.
ip  dnsbl  srv  tr PTR vl29-vrrp.westchester.pa.bo.comcast.net.
ip  dnsbl  srv  tr PTR vl29-ssl03.westchester.pa.bo.comcast.net.
ip  dnsbl  srv  tr PTR vl29-ssl04.westchester.pa.bo.comcast.net.
ip  dnsbl  srv  tr PTR udb-persona.westchester.pa.bo.comcast.net.
ip  dnsbl  srv  tr PTR udb-channelmap.westchester.pa.bo.comcast.net.
ip  dnsbl  srv  tr PTR vs_vip-udbns-wc-01.sys.comcast.net.
ip  dnsbl  srv  tr PTR vs_vip-udbns-wc-02.sys.comcast.net.
ip  dnsbl  srv  tr PTR vs_vip-udbds-wc-01.sys.comcast.net.
ip  dnsbl  srv  tr PTR vip-udbns-maint-wc-01.sys.comcast.net.
ip  dnsbl  srv  tr PTR umeproxy09.ndceast.pa.bo.comcast.net.
ip  dnsbl  srv  tr PTR udbmdh-wc-vip.sys.comcast.net.
ip  dnsbl  srv  tr PTR udb-mms.comcast.net.
ip  dnsbl  srv  tr PTR udb-rcsid.comcast.net.
ip  dnsbl  srv  tr PTR udb-gs.comcast.net.
ip  dnsbl  srv  tr PTR udb-nwb.comcast.net.
ip  dnsbl  srv  tr PTR udb-cdl.comcast.net.
ip  dnsbl  srv  tr PTR umeproxy19.ndceast.pa.bo.comcast.net.
ip  dnsbl  srv  tr PTR umeproxy20.ndceast.pa.bo.comcast.net.
ip  dnsbl  srv  tr PTR s-9-0-0-39-rr01.inflow.pa.bo.comcast.net.
ip  dnsbl  srv  tr PTR ues-wc-a-vip.sys.comcast.net.
ip  dnsbl  srv  tr PTR ues-wc-b-vip.sys.comcast.net.
ip  dnsbl  srv  tr PTR s-9-0-0-40-rr01.inflow.pa.bo.comcast.net.
ip  dnsbl  srv  tr PTR uesriak-wc-a-vip.sys.comcast.net.
ip  dnsbl  srv  tr PTR vl29-snatpool01.westchester.pa.bo.comcast.net.
ip  dnsbl  srv  tr PTR vl29-snatpool02.westchester.pa.bo.comcast.net.
ip  dnsbl  srv  tr PTR vl29-snatpool03.westchester.pa.bo.comcast.net.
ip  dnsbl  srv  tr PTR s-9-0-0-42-rr01.inflow.pa.bo.comcast.net.
ip  dnsbl  srv  tr PTR vip-udbtools-wc-01.sys.comcast.net.
ip  dnsbl  srv  tr PTR s-9-0-0-43-rr01.inflow.pa.bo.comcast.net.
ip  dnsbl  srv  tr PTR s-9-0-0-44-rr01.inflow.pa.bo.comcast.net.
ip  dnsbl  srv  tr PTR S-0-0-1-fr01.berlin.ct.pvcomcast.net.
ip  dnsbl  srv  tr PTR s-9-0-0-45-rr01.inflow.pa.bo.comcast.net.
ip  dnsbl  srv  tr PTR S-0-0-1-fr01.needham.ma.pvcomcast.net.
ip  dnsbl  srv  tr PTR s-9-0-0-46-rr01.inflow.pa.bo.comcast.net.
ip  dnsbl  srv  tr PTR ssl07-d-ssl08-d-floating.westchester.pa.bo.comcast.net.
ip  dnsbl  srv  tr PTR s-9-0-0-47-rr01.inflow.pa.bo.comcast.net.
ip  dnsbl  srv  tr PTR vl540-hsrp.ndceast.pa.bo.comcast.net.
ip  dnsbl  srv  tr PTR vl540-dr10.ndceast.pa.bo.comcast.net.
ip  dnsbl  srv  tr PTR vl540-dr11.ndceast.pa.bo.comcast.net.
ip  dnsbl  srv  tr PTR umedir01.ndceast.pa.bo.comcast.net.
ip  dnsbl  srv  tr PTR umedir01m.ndceast.pa.bo.comcast.net.
ip  dnsbl  srv  tr PTR umedir02m.ndceast.pa.bo.comcast.net.
ip  dnsbl  srv  tr PTR umeque01.ndceast.pa.bo.comcast.net.
ip  dnsbl  srv  tr PTR umeque02.ndceast.pa.bo.comcast.net.
ip  dnsbl  srv  tr PTR umeque03.ndceast.pa.bo.comcast.net.
ip  dnsbl  srv  tr PTR umeque04.ndceast.pa.bo.comcast.net.
ip  dnsbl  srv  tr PTR umeque05.ndceast.pa.bo.comcast.net.
ip  dnsbl  srv  tr PTR umeBrocade01.ndceast.pa.bo.comcast.net.
ip  dnsbl  srv  tr PTR umeBrocade02.ndceast.pa.bo.comcast.net.
ip  dnsbl  srv  tr PTR umeecc01.ndceast.pa.bo.comcast.net.
ip  dnsbl  srv  tr PTR umeems01.ndceast.pa.bo.comcast.net.
95 out of 256 IP addresses in appear to have a PTR.

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