go
rtp.usf.ibm.com, war.usf.ibm.com, tor.usf.ibm.com, boulder.usf.ibm.com, raleigh.usf.ibm.com and at least two other hosts are subdomains to this hostname. ibm.com is a domain controlled by four nameservers. All of them are on different IP networks. Incoming mail for ibm.com is handled by eleven mailservers. Some of them are on the same IP network. ibm.com has three IP numbers. All of them are on different IP networks.

ibm.com
a records
 
+ 129.42.16.103 129.42.16.0/24 AS16807  
+ ---  
+ 129.42.17.103 129.42.17.0/24 AS16807  
+ 129.42.18.103 129.42.18.0/24 AS16807  
ns-soa records
ns.watson.ibm.com
+ 129.34.20.80 129.34.0.0/16 AS1747 -
+ --- -
ns records
ns.almaden.ibm.com
+ 198.4.83.35 198.4.0.0/15 AS701 -
+ --- -
ns.austin.ibm.com
+ 192.35.232.34 192.35.232.0/24 AS701 -
ns.watson.ibm.com
+ 129.34.20.80 129.34.0.0/16 AS1747 -
internet-server.zurich.ibm.com
+ 195.176.20.204 195.176.0.0/16 AS559 -
mx records
e1.ny.us.ibm.com
+ 32.97.182.141 32.97.182.0/23 AS14912 -
+ --- -
e2.ny.us.ibm.com
+ 32.97.182.142 32.97.182.0/23 AS14912 -
e3.ny.us.ibm.com
+ 32.97.182.143 32.97.182.0/23 AS14912 -
e31.co.us.ibm.com
+ 32.97.110.149 32.97.110.0/24 AS2140 -
e32.co.us.ibm.com
+ 32.97.110.150 32.97.110.0/24 AS2140 -
e33.co.us.ibm.com
+ 32.97.110.151 32.97.110.0/24 AS2140 -
e34.co.us.ibm.com
+ 32.97.110.152 32.97.110.0/24 AS2140 -
e35.co.us.ibm.com
+ 32.97.110.153 32.97.110.0/24 AS2140 -
e4.ny.us.ibm.com
+ 32.97.182.144 32.97.182.0/23 AS14912 -
e5.ny.us.ibm.com
+ 32.97.182.145 32.97.182.0/23 AS14912 -
e6.ny.us.ibm.com
+ 32.97.182.146 32.97.182.0/23 AS14912 -
subdomains
boulder.usf.ibm.com
raleigh.usf.ibm.com
rtp.usf.ibm.com
southbury.usf.ibm.com
stlouis.usf.ibm.com
tor.usf.ibm.com
war.usf.ibm.com