| 0.0.0.0/32 | unspecified address (like :: in IPv6); see RFC1700 |
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| 0.0.0.0/8 | "This host on this network"; see RFC1122, section 3.2.1.3 (since 1981-Sep) |
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| 10.0.0.0/8 | private address space which can be used without registering, but must not be routed into or within the internet; see RFC1918 (since 1996-Feb) |
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| 44.0.0.0/8 | amateur radio |
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| 100.64.0.0/10 | shared address space, e.g. for carrier-grade NAT (CGN); see RFC6598 (since 2012-Apr) |
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| 127.0.0.0/8 | loopback-addresses (not to appear "on wire"); see RFC1122 (since 1981-Sep) |
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| 127.0.0.1 | localhost (like ::1 in IPv6) |
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| 141.24.0.0/16 | TU Ilmenau |
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| 169.254.0.0/16 | link local auto-config (APIPA, zeroconf), for local net use only; see RFC3330 (since 2002-Sep) |
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| 172.16.0.0/12 | private address space which can be used without registering, but must not be routed into or within the internet; see RFC1918 (since 1996-Feb) |
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| 192.0.0.0/24 | IETF Protocol Assignments; see RFC6890, section 2.1 (since 2010-Jan) |
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| 192.0.0.0/29 | DS-lite; see RFC6333 (since 2011-Jun) |
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| 192.0.2.0/24 | Documentation (TEST-NET-1); see RFC5737 (since 2010-Jan) |
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| 192.88.99.0/24 | 6to4 relay anycast, connecting to 2002::/16 resp. 2002:c058:6301:: in IPv6; see RFC3068 and RFC3330 (since 2001-Jun) |
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| 192.168.0.0/16 | private address space which can be used without registering, but must not be routed into or within the internet; see RFC1918 (since 1996-Feb) |
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| 198.18.0.0/15 | benchmarking; see RFC2544 (since 1999-Mar) |
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| 198.51.100.0/24 | Documentation (TEST-NET-2); see RFC5737 (since 2010-Jan) |
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| 203.0.113.0/24 | Documentation (TEST-NET-3); see RFC5737 (since 2010-Jan) |
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| 224.0.0.0/4 | multicast; see RFC3171 |
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| 240.0.0.0/4 | reserved; see RFC1112, section 4 (since 1989-Aug) |
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| 255.255.255.255/32 | limited broadcast, must not be routed into or within the internet; see RFC0919, section 7 (since 1984-Oct) |
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