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ibank.barclays.co.uk has two IP numbers. They are on different IP networks. www.ibank.barclays.co.uk cnames to this hostname. www.ibank.barclays.co.uk are subdomains to this hostname. barclays.co.uk is a domain controlled by four nameservers at barclays.com. Some of them are on the same IP network. Incoming mail for barclays.co.uk is handled by four mailservers also at barclays.com. All of them are on the same IP network. barclays.co.uk has one IP number. ibank.barclays.co.uk is hosted on two servers in United Kingdom.

ibank.barclays.co.uk
a records
 
+ 62.189.169.151 62.189.0.0/16 AS702  
+ ---  
+ 212.140.250.23 212.140.0.0/16 AS2856  

barclays.co.uk
a records
 
+ 213.219.1.141 213.219.0.0/18 AS15830  
+ ---  
ns-soa records
ns01.barclays.com
+ 213.120.81.216 213.120.0.0/14 AS2856  
+ ---  
ns records
ns01.barclays.com
+ 213.120.81.216 213.120.0.0/14 AS2856  
+ ---  
ns02.barclays.com
+ 213.120.81.217 213.120.0.0/14 AS2856  
ns03.barclays.com
+ 62.189.96.220 62.189.0.0/16 AS702  
ns04.barclays.com
+ 62.189.96.221 62.189.0.0/16 AS702  
mx records
mailgatep01.barclays.com
+ 207.126.147.10 207.126.147.0/24 AS26910 s200a1.psmtp.com
+ --- s200a1.psmtp.com
mailgatep02.barclays.com
+ 207.126.147.12 207.126.147.0/24 AS26910 s200a2.psmtp.com
+ --- s200a2.psmtp.com
mailgatep03.barclays.com
+ 207.126.147.13 207.126.147.0/24 AS26910 s200b1.psmtp.com
+ --- s200b1.psmtp.com
mailgatep04.barclays.com
+ 207.126.147.14 207.126.147.0/24 AS26910 s200b2.psmtp.com
+ --- s200b2.psmtp.com
ip numbers of host
212.140.250.23
62.189.169.151
hostnames pointing here by cname
www.ibank.barclays.co.uk
subdomains
www.ibank.barclays.co.uk