Index - U
| UDP | Net.DNSBase.RData.WKS, Net.DNSBase.RData.Obsolete |
| UL | Net.DNSBase.EDNS.OptNum, Net.DNSBase |
| unconsDomain | Net.DNSBase.Domain, Net.DNSBase |
| Update | Net.DNSBase.Opcode, Net.DNSBase |
| UserContext | Net.DNSBase.Error, Net.DNSBase |
| UserError | Net.DNSBase.Error, Net.DNSBase |