Please enable JavaScript.
Coggle requires JavaScript to display documents.
DNS (rDNS (PTR (To store rDNS records, there’s a specific type of DNS…
DNS
rDNS
PTR
To store rDNS records, there’s a specific type of DNS record called the PTR record. This record is also known as the “resource record” (RR), and specifies the IP addresses of all systems using an inverted notation
-
instead of resolving a domain name to an IP, it resolves an IP to a host name.
Do all types of IP addresses support rDNS? Absolutely, both IPv4 and IPv6 support rDNS lookups
-
DNAME
A DNAME-record is used to map / rename an entire sub-tree of the DNS name space to another domain. All names that end with a particular suffix are redirected to another part of the DNS.
-
TTL
If you ask your local DNS server for an Internet address, the server figures out where to find an authoritative answer and then asks for it. Once the server receives an answer, it will keep the answer in a local cache so that if you ask for the same address again a short time later, it can give you the answer quickly rather than searching the Internet for it all over again.
When domain administrators configure their DNS records, they decide how long the records should remain in remote caches. This is the TTL number (usually expressed in number of seconds).
CNAME
CNAME will resolve to another hostname first, and only then to an address
AAAA
In the Domain Name System, hostnames are mapped to IPv6 addresses by AAAA resource records, so-called quad-A records
-
Sometimes multiple hostnames will point to the same address, but that address will have only one reverse pointer.
-