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The result uses CIDR notation and can be used by an administrator to block a range of IP addresses. The template can be used by editing any page, inserting the template, and previewing the result. There is no need to save the edit.
Classless Inter-Domain Routing (CIDR / ˈ s aɪ d ər, ˈ s ɪ-/) is a method for allocating IP addresses for IP routing. The Internet Engineering Task Force introduced CIDR in 1993 to replace the previous classful network addressing architecture on the Internet .
First version of IANA table with historical notes via the Internet Archive Wayback Machine. "Internet Protocol v4 Address Space". Internet Assigned Numbers Authority (IANA). September 2007. Archived from the original on 28 October 2007 Last version of IANA table with historical notes via the Internet Archive Wayback Machine.
Toggle the table of contents. ... Address range Number of addresses Scope Description 0.0.0.0/8 ... Classless Inter-Domain Routing (CIDR)
I also agree linking this to range contribs, existing and previous blocks in the range, and other such goodies would be useful. But a stable accessible tool to find the nearest single range to block when there's a spree going on would be an excellent foundation. -- zzuuzz 20:48, 14 December 2014 (UTC) Thanks for the responses.
In support of link-local multicasts which do not use IGMP, any IPv4 multicast address that falls within the *.0.0.0 / 24 and *.128.0.0 / 24 ranges will be broadcast to all ports on many Ethernet switches, even if IGMP snooping is enabled, so addresses within these ranges should be avoided on Ethernet networks where the functionality of IGMP ...
Network address ranges are written in CIDR notation. A network is denoted by the first address in the block (ending in all zeroes), a slash (/), and a decimal value equal to the size in bits of the prefix.
RFC 1918 name IP address range Number of addresses Largest CIDR block (subnet mask) Host ID size Mask bits Classful description [Note 1]; 24-bit block: 10.0.0.0 – 10.255.255.255: 16 777 216