127.0.0.0/8 Special CIDR Block Math


127.0.0.0 is the Network Address in 127.0.0.0/8
CIDR block	127.0.0.0/8 !cidr !bgp
Valid CIDR block	127.0.0.0/8
Range: Network - Broadcast	127.0.0.0 - 127.255.255.255
Netmask	255.0.0.0
Number of IP addresses in the block	16777216 (1.677722e+07)
Network Address: 127.0.0.0 !ip !rdap !whois !bl !ptr24 !scan !tr !dnstr !g !gsec
Broadcast Address: 127.255.255.255 !ip !rdap !whois !bl !ptr24 !scan !tr !dnstr !g !gsec
127.0.0.0/8 - Loopback 127.0.0.0/8 was allocated on September of 1981. Addresses in 127.0.0.0/8 may NOT be used as the source address of an IP datagram that transits two devices. Addresses in 127.0.0.0/8 may NOT be used as the destination address of an IP datagram that transits two devices. Addresses in 127.0.0.0/8 are NOT forwardable. A router may NOT forward an IP datagram to Addresses in 127.0.0.0/8 between external interfaces Addresses in 127.0.0.0/8 are NOT globally reachable An IP datagram may NOT be forwarded to Addresses in 127.0.0.0/8 beyond a specified administative domain. The RFC that created 127.0.0.0/8 requires all compliant IP implementations to behave in a special way when processing packets either to or from addresses contained by 127.0.0.0/8 127.0.0.0/8 is the Internet host loopback address block. A datagram sent by a higher-level protocol to an addreess anywhere within this block loops back inside the host. This is ordinarily implemented using only 127.0.0.1 for loopback. Addresses within the entire 127.0.0.0/8 block do not legitimately appear on any network anywhere. [ RFC1122, ^ ] , Section 3.2.1.3 However, several protocols have been granted exceptions to these rules. For examples of exceptions see [ RFC8029, ^ ] , [ RFC5884, ^ ]
!g 127.0.0.0/8

  
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