ns15.customer.level3.net has one IP number , which also has a corresponding reverse pointer. yu.edu, a1n.net, lza.com, syr.edu, wapa.gov and at least 100 other hosts use this as a nameserver. customer.level3.net is delegated to 32 nameservers, however all 32 delegated nameservers are missing in the zone. All nameservers are at customer.level3.net themselves having a total of 33 IP numbers. Some of them are on the same IP network. ns15.customer.level3.net is hosted on a server in United States.