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A wildcard mask is a mask of bits that indicates which parts of an IP address are available for examination. In the Cisco IOS, [1] they are used in several places, for example: To indicate the size of a network or subnet for some routing protocols, such as OSPF. To indicate what IP addresses should be permitted or denied in access control lists ...
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. As an example, you could edit your sandbox and replace its contents with
Domaintools – Probably the most comprehensive of the WHOIS tools, however requires you enter a CAPTCHA and has a limit of about 50 lookups a day. Be sure to check not just the ASN but the network name, etc, when attempting to determine if an IP belongs to a school or is otherwise shared.
NativeForeigner's range calculator; blockcalc on tool labs; Tools to check range contributions: Range calc gadget (recommended). Go to your gadgets and enable "Allow /16, /24 and /27 – /32 CIDR ranges on Special:Contributions". From here you can go to Special:Contribs and enter the CIDR range in
To configure IP addresses on interfaces, masks start with 255 and have the large values on the left side: for example, IP address 203.0.113.129 with a 255.255.255.224 mask. Masks for IP ACLs are the reverse: for example, mask 0.0.0.255. This is sometimes called an inverse mask or a wildcard mask. When the value of the mask is broken down into ...
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Just a quick note for now: I've been using NativeForeigner's range block calculator as a substitute for the one on WMF labs. You might want to check it out. Mike V • Talk 11:11, 14 December 2014 (UTC) I tend to do this stuff in my head and through DNS/WHOIS tools, but a range block calculator is essential for any range blocking admin.
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