er.usgs.gov is a domain controlled by three nameservers. All of them are on the same IP network. jo, mil.jo, net.jo, gov.jo, org.jo and at least 48 other hosts share nameservers with this domain. ns.er.usgs.gov, dns.er.usgs.gov, nst.er.usgs.gov, mica.er.usgs.gov, dss1.er.usgs.gov and at least 100 other hosts are subdomains to this hostname. usgs.gov is a domain controlled by three nameservers. All of them are on the same IP network. Incoming mail for usgs.gov is handled by three mailservers. All of them are on different IP networks. usgs.gov has nine IP numbers. Some of them are on the same IP network.