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143.163.216.in-addr.arpa is delegated to two nameservers, however two extra nameservers are listed in the zone. Some of them are on the same IP network. cjavn.com, adult.com, surfvod.com, spicetv.com, hushdvd.com and at least 24 other hosts share nameservers with this domain.

143.163.216.in-addr.arpa
ns-soa records
ns1-chi.playboy.com
+ 216.163.136.24 216.163.136.0/23 AS14068 -
+ --- -
ns records
ns1-chi.playboy.com
+ 216.163.136.24 216.163.136.0/23 AS14068 -
+ --- -
ns2-chi.playboy.com
+ 216.163.136.34 216.163.136.0/23 AS14068 -
ns1.lax.pedn.net
+ 10.100.16.33 10.0.0.0/8 AS6067  
+ ---  
ns2.lax.pedn.net
+ 10.100.16.34 10.0.0.0/8 AS6067  
nameservers used by this domain
ns1-chi.playboy.com
ns1.lax.pedn.net
ns2-chi.playboy.com
ns2.lax.pedn.net
domains sharing nameservers
adult.com
adultstarcentral.com
anytimemovies.com
anytimemovies.net
anytimevideo.com
caracasplayboy.com
carrieshill.com
choicevod.com
cjavn.com
cjidigital.com
clubplayboy.com.br
confidentialcuts.net
executive-playmates.com
flixsurfer.com
free-jenna-jameson-movie-clip.com
havenxxx.com
hotplaymates.net
hushdvd.com
jennacash.com
playboy.com
playboygaming.com
playboygolf.com
playmatepics.com
skankass.com
spiceclips.com
spicetv.com
surfvod.com
suziesdormroom.com
sysrefer.com
ip numbers of nameservers
10.100.16.33
10.100.16.34
216.163.136.24
216.163.136.34
reverse names of the nameservers
ns1-chi.playboy.com
ns2-chi.playboy.com
nameservers missing in parent delegation
ns1.lax.pedn.net
ns2.lax.pedn.net