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A wildcard DNS record is a record in a DNS zone that will match requests for non-existent domain names. A wildcard DNS record is specified by using a * as the leftmost label (part) of a domain name, e.g. *.example.com. The exact rules for when a wildcard will match are specified in RFC 1034, but the rules are neither intuitive nor clearly ...
A wildcard mask can be thought of as an inverted subnet mask. For example, a subnet mask of 255.255.255.0 (11111111.11111111.11111111.00000000 2) inverts to a wildcard mask of 0.0.0.255 (00000000.00000000.00000000.11111111 2). A wild card mask is a matching rule. [2] The rule for a wildcard mask is: 0 means that the equivalent bit must match
For example, if there is both an A and an MX for a name, but the name server has only the A record cached, only the A record will be returned. Usually referred to as ANY (e.g., in dig , Windows nslookup , and Wireshark ).
I get the sense, from reading the wildcards part of RFC1034, that Paul was just codifying in an RFC the consequence of how an early DNS server stored its records in memory. Samboy 09:20, 9 October 2005 (UTC) As of MaraDNS 1.2.02, MaraDNS now has the ability to optionally handle wildcards in a more RFC-compliant manner.
Wildcard Servers with this feature can publish information for wildcard records, which provide data about DNS names in DNS zones that are not specifically listed in the zone. Split horizon Servers with the split-horizon DNS feature can give different answers depending on the source IP address of the query.
Wildcard DNS record, a record in a DNS zone file that will match all requests for non-existent domain names Wildcard mask , a netmask that swaps 1 to 0 and 0 to 1 compared to the normal netmask Wildcard certificate , a public key certificate used to secure multiple subdomains
Dot-separated fully qualified domain names are the primarily used form for human-readable representations of a domain name. Dot-separated domain names are not used in the internal representation of labels in a DNS message [7] but are used to reference domains in some TXT records and can appear in resolver configurations, system hosts files, and URLs.
The DNS protocol specifies that when a client queries for a specific record type (e.g., TXT) for a certain domain name (e.g., example.com), all records of that type must be returned in the same DNS message. That may lead to large transactions with lots of "unnecessary" information being transferred and/or uncertainty about which TXT record to use.