| OHTTP | Net.DNSBase.RData.SVCB, Net.DNSBase |
| opaqueEdnsOption | Net.DNSBase.EDNS.Option.Opaque, Net.DNSBase |
| OpaqueOption | |
| 1 (Type/Class) | Net.DNSBase.EDNS.Option.Opaque, Net.DNSBase |
| 2 (Data Constructor) | Net.DNSBase.EDNS.Option.Opaque, Net.DNSBase |
| OpaqueRData | |
| 1 (Type/Class) | Net.DNSBase.RData, Net.DNSBase |
| 2 (Data Constructor) | Net.DNSBase.RData, Net.DNSBase |
| opaqueRData | Net.DNSBase.RData, Net.DNSBase |
| OpaqueSPV | |
| 1 (Type/Class) | Net.DNSBase.RData.SVCB, Net.DNSBase |
| 2 (Data Constructor) | Net.DNSBase.RData.SVCB, Net.DNSBase |
| opaqueSPV | Net.DNSBase.RData.SVCB, Net.DNSBase |
| Opcode | |
| 1 (Type/Class) | Net.DNSBase.Opcode, Net.DNSBase |
| 2 (Data Constructor) | Net.DNSBase.Opcode, Net.DNSBase |
| OPENPGPKEY | Net.DNSBase.RRTYPE, Net.DNSBase |
| openpgpKey | Net.DNSBase.RData.TLSA, Net.DNSBase |
| OPT | Net.DNSBase.RRTYPE, Net.DNSBase |
| optCtlAdd | Net.DNSBase.EDNS.Option, Net.DNSBase |
| optCtlSet | Net.DNSBase.EDNS.Option, Net.DNSBase |
| optDecode | Net.DNSBase.EDNS.Option, Net.DNSBase.Resolver, Net.DNSBase |
| optEncode | Net.DNSBase.EDNS.Option, Net.DNSBase.Resolver, Net.DNSBase |
| optionCode | Net.DNSBase.EDNS.Option, Net.DNSBase |
| OptionCodec | Net.DNSBase.EDNS.Option, Net.DNSBase |
| OptionCtl | Net.DNSBase.EDNS.Option, Net.DNSBase |
| OptionExtensionVal | Net.DNSBase.EDNS.Option, Net.DNSBase.Resolver, Net.DNSBase, Net.DNSBase |
| optionExtensionVal | Net.DNSBase.EDNS.Option, Net.DNSBase.Resolver, Net.DNSBase |
| OptNum | |
| 1 (Type/Class) | Net.DNSBase.EDNS.OptNum, Net.DNSBase |
| 2 (Data Constructor) | Net.DNSBase.EDNS.OptNum, Net.DNSBase |
| optNum | Net.DNSBase.EDNS.Option, Net.DNSBase.Resolver, Net.DNSBase |
| optPres | Net.DNSBase.EDNS.Option, Net.DNSBase.Resolver, Net.DNSBase |
| O_DAU | Net.DNSBase.EDNS.Option.Secalgs, Net.DNSBase |
| O_dau | Net.DNSBase.EDNS.Option.Secalgs, Net.DNSBase |
| O_DHU | Net.DNSBase.EDNS.Option.Secalgs, Net.DNSBase |
| O_dhu | Net.DNSBase.EDNS.Option.Secalgs, Net.DNSBase |
| O_ECS | Net.DNSBase.EDNS.Option.ECS, Net.DNSBase |
| O_ecs | Net.DNSBase.EDNS.Option.ECS, Net.DNSBase |
| O_EDE | Net.DNSBase.EDNS.Option.EDE, Net.DNSBase |
| O_ede | Net.DNSBase.EDNS.Option.EDE, Net.DNSBase |
| O_N3U | Net.DNSBase.EDNS.Option.Secalgs, Net.DNSBase |
| O_n3u | Net.DNSBase.EDNS.Option.Secalgs, Net.DNSBase |
| O_NSID | Net.DNSBase.EDNS.Option.NSID, Net.DNSBase |
| O_nsid | Net.DNSBase.EDNS.Option.NSID, Net.DNSBase |