go
mx1.won.pt, mx1.igtelecom.net and mail-qy0-f15.google.com point to 209.85.221.15.

mail-qy0-f15.google.com
a records
 
+ 209.85.221.15 209.85.221.0/24 AS15169 -
+ --- -

mx1.igtelecom.net
cname records
aspmx.l.google.com
+ 209.85.221.15 209.85.221.0/24 AS15169 mail-qy0-f15.google.com
+ --- mail-qy0-f15.google.com

mx1.won.pt
cname records
aspmx.l.google.com
+ 209.85.221.15 209.85.221.0/24 AS15169 mail-qy0-f15.google.com
+ --- mail-qy0-f15.google.com
ip numbers of host
209.85.221.15
ptrs of ip numbers
mail-qy0-f15.google.com
hostnames sharing ip with a-records
mail-qy0-f15.google.com
mx1.igtelecom.net
mx1.won.pt
domains using this as mailserver
igtelecom.net
won.pt