go
ns1.cisco.com has one IP number , which also has a corresponding reverse pointer. mp.net, ieng.net, tidal.net, okena.net, e-life.tv and at least 100 other hosts use this as a nameserver. cisco.com is a domain controlled by two nameservers at cisco.com themselves. They are on different IP networks. Incoming mail for cisco.com is handled by nine mailservers also at cisco.com. Some of them are on the same IP network. cisco.com has one IP number. ns1.cisco.com is hosted on a server in United States.

ns1.cisco.com
a records
 
+ 128.107.241.185 128.107.0.0/16 AS109 -
+ --- -

cisco.com
a records
 
+ 198.133.219.25 198.133.219.0/24 AS109  
+ ---  
ns records
ns1.cisco.com
+ 128.107.241.185 128.107.0.0/16 AS109 -
+ --- -
ns2.cisco.com
+ 64.102.255.44 64.102.0.0/16 AS109 -
mx records
rtp-mx-01.cisco.com
+ 64.102.255.47 64.102.0.0/16 AS109 -
+ --- -
ams-inbound-a.cisco.com
+ 64.103.36.153 64.103.0.0/17 AS109 -
sj-inbound-a.cisco.com
+ 128.107.234.204 128.107.0.0/16 AS109 -
sj-inbound-b.cisco.com
+ 128.107.234.205 128.107.0.0/16 AS109 -
sj-inbound-c.cisco.com
+ 128.107.234.206 128.107.0.0/16 AS109 -
sj-inbound-d.cisco.com
+ 128.107.243.13 128.107.0.0/16 AS109 -
sj-inbound-e.cisco.com
+ 128.107.243.14 128.107.0.0/16 AS109 -
sj-inbound-f.cisco.com
+ 128.107.234.207 128.107.0.0/16 AS109 -
syd-inbound-a.cisco.com
+ 64.104.252.248 64.104.192.0/18 AS109 -
ip numbers of host
128.107.241.185
ptrs of ip numbers
ns1.cisco.com
ip numbers using ptr to this host
128.107.241.185
domains using this as nameserver
102.64.in-addr.arpa
103.64.in-addr.arpa
104.64.in-addr.arpa
107.128.in-addr.arpa
163.72.in-addr.arpa
219.133.198.in-addr.arpa
68.171.in-addr.arpa
academynetspace.com
aeropoint.net
aironet.net
altiga.net
altiganetworks.net
amteva.net
bluevuelive.com
builtforbroadband.net
buyiphone.net
byiphone.net
c-i-s-c-o.net
cioscopark.net
cisco-online.net
cisco-secure.net
cisco-security.net
cisco.com
cisco.net
ciscobenefits.net
ciscobroadband.net
ciscobroadbandmag.net
ciscocomputers.net
ciscoconnects.net
ciscodsl.net
ciscoenespanol.net
ciscofield.net
ciscoglobaldsl.net
ciscointernethome.net
ciscoiq.net
ciscopacket.net
ciscopaw.net
ciscopowerednetwork.net
ciscopowerednetworks.net
ciscore.net
ciscosecure.net
ciscosecurity.net
ciscosistemas.net
ciscosistemi.net
ciscostadium.net
ciscostudy.net
ciscosysteme.net
ciscosystems.net
ciscosystemsnetwork.net
ciscotechnologyinc.net
ciscotechs.net
ciscotelco.net
ciscotraining.net
classdata.com
cognio.com
e-life.tv
e-skills-summit.org
greenfieldnetworks.com
growthnetworks.com
homerf.net
ieng.net
ihomealliance.net
infogear.com
infogear.net
iphone.net
iphonesales.net
iq-magazine.net
iqmagazine.net
iqportal.net
irismail.net
lanpbx.net
latigent.com
laureatesonline.net
linksys.com
linksyssucks.net
mamaison-net.net
mamaisonnet.net
maxcommtech.com
meetingplace.net
mp.net
netacad-assessment.net
netacad-currdev.net
netacad-data.net
netacad-reports.net
netacad-research.net
netacad-survey.net
netacad.net
netimpactstudy.com
netiverse.net
netsift.net
news.linksys.com
newsroom.cisco.com
nuspeed.net
okena.net
onbusinessnetwork.com
p-cube.net
partner-seminar.net
pixstream.net
planetcisco.net
powertv.com
pvconnect.net
richards-zeta.com
sciatl.com
sem-central.net
seminar-go.net
smtp.news.linksys.com
stratumone.com
sypixx.com
teltier.net
tidal.net
tivella.com
to-the-point.net
unity-net.net
versedge.com
vovida.net
vpn-concentrator.net
vpn-concentrators.net
vpn-hardware.net
vpn-products.net
vpnconcentrator.net
used as nameserver but missing in zone
68.171.in-addr.arpa
airespace.net
altiganetworks.net
bluevuelive.com
cisco-security.net
ciscodsl.net
ciscoglobaldsl.net
ciscoipphone.net
ciscoondemand.net
ciscosystem.net
ciscosystemes.net
ciscosystemsinvestments.net
ciscotechs.net
ciscotelco.net
clearresponse.net
linksyshelp.net
linksyssucks.net
onbusinessnetwork.net
openib.net
orative.net
psionic.net
vpn-concentrators.net
vpn-products.net
vpnconcentrator.net