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DNS What Is IT & DNS How To Use It

DNS and what is it explained. DNS changes to propagate information. How to us dns.


DNS Everythng You Need To Know

Here we will do our best to explain DNs. Ip address, cache responses, propagation technique, and lots more.

How Long Does It Take For DNS Changes To Propagate?


This depends on your TTL (time to live) setting in your DNS record.
This setting varies by name server and you can view the TTL by looking up the SOA record for your domain. http://centralops.net/co/ offers a good tool for this.


TTL is listed in seconds so divide by 60 to get the minutes then divide again by 60 to get the number of hours.


Our default TTL is one day. That means any changes or modifications to your domain name will take one day to propagate throughout the entire internet. You can adjust your TTL if you plan on making changes quite often. If your lower to your TTL, it will put an increased load on the name servers and could potentially increase the response time to end customers.


For example, if someone on the someplace.com were to view your website, Someone.com DNS resolvers would cache your domain name information for the term of the TTL and all future someone.com users would use the local cached information. If you lower your TTL to a few minutes, your domain name information would propagate faster - but there would be little caching of your domain name information and DNS resolution would occur every few minutes. The Higher the setting the higher DNS performance due to local ISP caching.


Lower the setting - lower DNS performance due to increased name resolution


Are you having trouble with DNS. If your computer can't fid a web adress. Because your computer doesn’t understand where your web address (.com ) is.

Computers cache DNS responses locally. Such DNS request won’t happen every time you connect to a particular domain name that you have already visited. Once your computer knows the IP address associated with a domain name, it will remember that for a period of time. This will improve connection speeds by skipping the DNS request phase.

OpenDNS has returned the IP address of a website with a “Blocked” messsage instead of the IP address of the pornographic website—this takes advantage of the way DNS works to block websites.

Dns Common Terms

A guideline of the most common terms and meanings associated with DNS

A Record - A single data point based on a certain type that directs DNS zones on how to process incoming queries. For example, the DNS zone can have multiple DNS records, such as www.google.com, mail.google.com, or maps.google.com.

Authoritative - The purpose of the Authoritative DNS server is to provide an answer for the recursive resolver, also known as the recursive server. An authoritative DNS server has the mapping of the IP addresses of requested websites.

CNAME - This is a record that can be used as an alias for a hostname. For example, maps.google.com is a CNAME for the host name google.com.

Delegation - This is the process of assigning responsibility of handling certain domains and sub-domains to a name server.

DNS Query - An inquiry from a user to translate, or resolve, a domain name for an IP address.

DNS Zone - A specified section of the DNS namespace that has been broken up into sections, or zones; for the better management of DNS queries in the DNS zone. Each DNS Zone has specific DNS records that include information mapped to that zone about a domain.

IP Address - This is a specific identifier for a computer system or device that enables computers on the Internet to locate and communicate together. It is exactly as the name implies: an address.

MX Server - The MX Server is the server responsible for handling emails for a specific domain. MX stands for Mail Exchange.

Name Server - The name server forms part of the domain name system that has been set up to answer queries regarding domains. This is a DNS server designated to handle DNS queries and/or provide additional information about the domain.

Recursive Query - This identifies requests from a user for information pertaining to domain names to identify IP addresses.

Resolver - The recursive resolver, or recursive server, sends out requests for information and refers back to itself until the requested information is acquired.

Root - These are name servers that are known among all name servers. They forward the ISP’s recursive DNS server to an authoritative DNS server, which is responsible for handling that specific domain. This ultimately provides the corresponding IP address the website being sought.

Start of Authority Record (SoA) - The start of authority record provides details of the basic properties of a zone, and is the first resource record in the system for that zone. Some of the details it includes are the host name, email of the person responsible for the domain, the zone serial number, and TTL.

Top-level domain (TLD) - TLD is the highest level of the DNS hierarchy, examples of which include .com, .org, .net, etc.

Time-to-Live (TTL) - TTL is a fundamental part of DNS records, as it sets the time lag before a DNS record is refreshed. It does this by defining the cache timeframe in seconds.


We are adding a lot more information to help about websites, DNS and what is it and how to use it. DNS changes.


Special thanks to OpenDNS Here is how your set your computer if the need be. If your ISP is having issues with its DNS service, switching to OpenDNS' DNS will get you back online in just a few quick steps. Follow the instructions for your operating system. And Website Webmaster Tools a2000greetings - Web and webmaster development tools and information we need for building our websites.


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