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hsd1.ma.comcast.net are subdomains to this hostname. comcast.net is a domain controlled by three nameservers at comcast.net themselves. All of them are on different IP networks. Incoming mail for comcast.net is handled by eight mailservers also at comcast.net. There are four duplicated IP numbers. Some of them are on the same IP network. comcast.net has four IP numbers. Some of them are on the same IP network.

comcast.net
a records
 
+ 76.96.38.12 76.96.32.0/21 AS36732  
+ ---  
+ 76.96.38.13 76.96.32.0/21 AS36732  
+ 76.96.54.12 76.96.48.0/20 AS36733  
+ 76.96.54.13 76.96.48.0/20 AS36733  
ns-soa records
dns101.comcast.net
+ 68.87.64.204 68.87.64.0/23 AS36733 dns101.inflow.pa.bo.comcast.net
+ --- dns101.inflow.pa.bo.comcast.net
ns records
dns101.comcast.net
+ 68.87.64.204 68.87.64.0/23 AS36733 dns101.inflow.pa.bo.comcast.net
+ --- dns101.inflow.pa.bo.comcast.net
dns103.comcast.net
+ 68.87.76.228 68.87.76.0/24 AS33651 dns103.sanjose.ca.sfba.comcast.net
+ --- dns103.sanjose.ca.sfba.comcast.net
dns102.comcast.net
+ 68.87.66.204 68.87.66.0/23 AS36732 dns102.cmc.co.denver.comcast.net
+ --- dns102.cmc.co.denver.comcast.net
mx records
mx1a.comcast.net
+ 76.96.62.116 76.96.48.0/20 AS36733 imta.westchester.pa.mail.comcast.net
+ --- imta.westchester.pa.mail.comcast.net
mx1b.comcast.net
+ 76.96.62.116 76.96.48.0/20 AS36733 imta.westchester.pa.mail.comcast.net
mx2a.comcast.net
+ 76.96.30.116 76.96.24.0/21 AS33664 imta.emeryville.ca.mail.comcast.net
+ --- imta.emeryville.ca.mail.comcast.net
mx2b.comcast.net
+ 76.96.30.116 76.96.24.0/21 AS33664 imta.emeryville.ca.mail.comcast.net
mx3.comcast.net
+ 76.96.58.14 76.96.48.0/20 AS36733 imta2.westchester.pa.mail.comcast.net
+ --- imta2.westchester.pa.mail.comcast.net
mx4.comcast.net
+ 76.96.26.14 76.96.24.0/21 AS33664 imta2.emeryville.ca.mail.comcast.net
+ --- imta2.emeryville.ca.mail.comcast.net
mx1.comcast.net
+ 76.96.62.116 76.96.48.0/20 AS36733 imta.westchester.pa.mail.comcast.net
+ --- imta.westchester.pa.mail.comcast.net
mx2.comcast.net
+ 76.96.30.116 76.96.24.0/21 AS33664 imta.emeryville.ca.mail.comcast.net
+ --- imta.emeryville.ca.mail.comcast.net
subdomains
hsd1.ma.comcast.net