2011-06-10 2025-06-16 Once a zone is added to one of these subregistries, it is effectively added permanently; once an address range starts being configured as a local zone in systems on the Internet, it will be impossible to reverse those changes. IETF Review 10.IN-ADDR.ARPA RFC1918 Zone 16.172.IN-ADDR.ARPA RFC1918 Zone 17.172.IN-ADDR.ARPA RFC1918 Zone 18.172.IN-ADDR.ARPA RFC1918 Zone 19.172.IN-ADDR.ARPA RFC1918 Zone 20.172.IN-ADDR.ARPA RFC1918 Zone 21.172.IN-ADDR.ARPA RFC1918 Zone 22.172.IN-ADDR.ARPA RFC1918 Zone 23.172.IN-ADDR.ARPA RFC1918 Zone 24.172.IN-ADDR.ARPA RFC1918 Zone 25.172.IN-ADDR.ARPA RFC1918 Zone 26.172.IN-ADDR.ARPA RFC1918 Zone 27.172.IN-ADDR.ARPA RFC1918 Zone 28.172.IN-ADDR.ARPA RFC1918 Zone 29.172.IN-ADDR.ARPA RFC1918 Zone 30.172.IN-ADDR.ARPA RFC1918 Zone 31.172.IN-ADDR.ARPA RFC1918 Zone 168.192.IN-ADDR.ARPA RFC1918 Zone 0.IN-ADDR.ARPA IPv4 "THIS" NETWORK 127.IN-ADDR.ARPA IPv4 LOOPBACK NETWORK 254.169.IN-ADDR.ARPA IPv4 LINK LOCAL 2.0.192.IN-ADDR.ARPA IPv4 TEST-NET-1 100.51.198.IN-ADDR.ARPA IPv4 TEST-NET-2 113.0.203.IN-ADDR.ARPA IPv4 TEST-NET-3 255.255.255.255.IN-ADDR.ARPA IPv4 BROADCAST 64.100.IN-ADDR.ARPA RFC6598 Zone 65.100.IN-ADDR.ARPA RFC6598 Zone 66.100.IN-ADDR.ARPA RFC6598 Zone 67.100.IN-ADDR.ARPA RFC6598 Zone 68.100.IN-ADDR.ARPA RFC6598 Zone 69.100.IN-ADDR.ARPA RFC6598 Zone 70.100.IN-ADDR.ARPA RFC6598 Zone 71.100.IN-ADDR.ARPA RFC6598 Zone 72.100.IN-ADDR.ARPA RFC6598 Zone 73.100.IN-ADDR.ARPA RFC6598 Zone 74.100.IN-ADDR.ARPA RFC6598 Zone 75.100.IN-ADDR.ARPA RFC6598 Zone 76.100.IN-ADDR.ARPA RFC6598 Zone 77.100.IN-ADDR.ARPA RFC6598 Zone 78.100.IN-ADDR.ARPA RFC6598 Zone 79.100.IN-ADDR.ARPA RFC6598 Zone 80.100.IN-ADDR.ARPA RFC6598 Zone 81.100.IN-ADDR.ARPA RFC6598 Zone 82.100.IN-ADDR.ARPA RFC6598 Zone 83.100.IN-ADDR.ARPA RFC6598 Zone 84.100.IN-ADDR.ARPA RFC6598 Zone 85.100.IN-ADDR.ARPA RFC6598 Zone 86.100.IN-ADDR.ARPA RFC6598 Zone 87.100.IN-ADDR.ARPA RFC6598 Zone 88.100.IN-ADDR.ARPA RFC6598 Zone 89.100.IN-ADDR.ARPA RFC6598 Zone 90.100.IN-ADDR.ARPA RFC6598 Zone 91.100.IN-ADDR.ARPA RFC6598 Zone 92.100.IN-ADDR.ARPA RFC6598 Zone 93.100.IN-ADDR.ARPA RFC6598 Zone 94.100.IN-ADDR.ARPA RFC6598 Zone 95.100.IN-ADDR.ARPA RFC6598 Zone 96.100.IN-ADDR.ARPA RFC6598 Zone 97.100.IN-ADDR.ARPA RFC6598 Zone 98.100.IN-ADDR.ARPA RFC6598 Zone 99.100.IN-ADDR.ARPA RFC6598 Zone 100.100.IN-ADDR.ARPA RFC6598 Zone 101.100.IN-ADDR.ARPA RFC6598 Zone 102.100.IN-ADDR.ARPA RFC6598 Zone 103.100.IN-ADDR.ARPA RFC6598 Zone 104.100.IN-ADDR.ARPA RFC6598 Zone 105.100.IN-ADDR.ARPA RFC6598 Zone 106.100.IN-ADDR.ARPA RFC6598 Zone 107.100.IN-ADDR.ARPA RFC6598 Zone 108.100.IN-ADDR.ARPA RFC6598 Zone 109.100.IN-ADDR.ARPA RFC6598 Zone 110.100.IN-ADDR.ARPA RFC6598 Zone 111.100.IN-ADDR.ARPA RFC6598 Zone 112.100.IN-ADDR.ARPA RFC6598 Zone 113.100.IN-ADDR.ARPA RFC6598 Zone 114.100.IN-ADDR.ARPA RFC6598 Zone 115.100.IN-ADDR.ARPA RFC6598 Zone 116.100.IN-ADDR.ARPA RFC6598 Zone 117.100.IN-ADDR.ARPA RFC6598 Zone 118.100.IN-ADDR.ARPA RFC6598 Zone 119.100.IN-ADDR.ARPA RFC6598 Zone 120.100.IN-ADDR.ARPA RFC6598 Zone 121.100.IN-ADDR.ARPA RFC6598 Zone 122.100.IN-ADDR.ARPA RFC6598 Zone 123.100.IN-ADDR.ARPA RFC6598 Zone 124.100.IN-ADDR.ARPA RFC6598 Zone 125.100.IN-ADDR.ARPA RFC6598 Zone 126.100.IN-ADDR.ARPA RFC6598 Zone 127.100.IN-ADDR.ARPA RFC6598 Zone IETF Review 0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.IP6.ARPA IPv6 Unspecified Address 1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.IP6.ARPA IPv6 Loopback Address D.F.IP6.ARPA IPv6 Locally Assigned Local Address 8.E.F.IP6.ARPA IPv6 Link Local Address 9.E.F.IP6.ARPA IPv6 Link Local Address A.E.F.IP6.ARPA IPv6 Link Local Address B.E.F.IP6.ARPA IPv6 Link Local Address 8.B.D.0.1.0.0.2.IP6.ARPA IPv6 Example Prefix IETF Review HOME.ARPA Homenet Special-Use Domain RESOLVER.ARPA DNS Resolver Special-Use Domain SERVICE.ARPA DNS‑SD Service Registration Protocol Special-Use Domain Standards Action or IESG Approval default.service.arpa. Default domain for SRP updates