The availability of a website is measured by the percentage of a year in which the website is publicly accessible and reachable via the Internet. This is different from measuring the uptime of a system. Uptime refers to the system itself being online. Uptime does not take into account being able to reach it as in the event of a network outage.[citation needed] A hosting provider's Service Level Agreement (SLA) may include a certain amount of scheduled downtime per year in order to perform maintenance on the systems. This scheduled downtime is often excluded from the SLA timeframe, and needs to be subtracted from the Total Time when availability is calculated. Depending on the wording of an SLA, if the availability of a system drops below that in the signed SLA, a hosting provider often will provide a partial refund for time lost. How downtime is determined changes from provider to provider, therefore reading the SLA is imperative.[11] Not all providers release uptime statistics.[12] Most hosting providers will guarantee at least 99.9% uptime which will allow for 43m of downtime per month, or 8h 45m of downtime per year.
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Administrative contact. A registrant usually designates an administrative contact to manage the domain name. The administrative contact usually has the highest level of control over a domain. Management functions delegated to the administrative contacts may include management of all business information, such as name of record, postal address, and contact information of the official registrant of the domain and the obligation to conform to the requirements of the domain registry in order to retain the right to use a domain name. Furthermore, the administrative contact installs additional contact information for technical and billing functions.
The host may also provide an interface or control panel for managing the Web server and installing scripts, as well as other modules and service applications like e-mail. A web server that does not use a control panel for managing the hosting account, is often referred to as a "headless" server. Some hosts specialize in certain software or services (e.g. e-commerce, blogs, etc.).

18. Host1PlusHost1Plus is a unified solution for VPS hosting, fast cloud storage, IPv4 & IPv6, and full DNS control. It comes with powerful API, KVM virtualization, and custom ISO for Windows and Linux users. The scalable architecture allows Host1Plus to follow your growing demands, and boost all necessary resources with both managed and unmanaged plans. All unmanaged plans are TUN/TAP/PPP enabled and come with SSD caching, 500 Mbps uplink, Virtuozzo & OpenVZ, backups, and RAID data storage for up to 32 IPv4 addresses. You can use Host1Plan to create your domain zones and edit records directly at your Client Area, and control several Linux OS instances (Ubuntu, Fedora, Debian, CentOS, and Suse). You can also connect your virtual console to their emergency console to retrieve access to your server, and protect your data.
Critics often claim abuse of administrative power over domain names. Particularly noteworthy was the VeriSign Site Finder system which redirected all unregistered .com and .net domains to a VeriSign webpage. For example, at a public meeting with VeriSign to air technical concerns about SiteFinder,[25] numerous people, active in the IETF and other technical bodies, explained how they were surprised by VeriSign's changing the fundamental behavior of a major component of Internet infrastructure, not having obtained the customary consensus. SiteFinder, at first, assumed every Internet query was for a website, and it monetized queries for incorrect domain names, taking the user to VeriSign's search site. Unfortunately, other applications, such as many implementations of email, treat a lack of response to a domain name query as an indication that the domain does not exist, and that the message can be treated as undeliverable. The original VeriSign implementation broke this assumption for mail, because it would always resolve an erroneous domain name to that of SiteFinder. While VeriSign later changed SiteFinder's behaviour with regard to email, there was still widespread protest about VeriSign's action being more in its financial interest than in the interest of the Internet infrastructure component for which VeriSign was the steward.
A handful of domains will have restrictions on them, which means you can only purchase them if you meet or exceed certain criteria or have authorization (some examples are .gov, .edu and .mil). But most extensions are available to everyone. In fact, most country code Top Level Domains (ccTLDs) are available for anyone to purchase, even if you don't reside in the country code in question.
Shared hosting is web hosting in which the provider houses multiple sites on a single server. For example, Site A shares the same server with Site B, Site C, Site D, and Site E. The upside is that the multiple sites share the server cost, so shared web hosting is generally very inexpensive. In fact, you can find an option for less than $10 per month.
It shouldn't come as any surprise that, like other web host providers, A2 Hosting's unlimited plans aren't actually unlimited. It expect you to use its service like "similarly situated customers." This is like being on a highway. If everyone is going a few miles above the speed limit, you're probably okay, but if you're barreling down the fast lane past everyone else, you're probably going to be asked to slow down.
You get other customer-centric bonuses for 24/7 customer support, including 24/7 toll-free callback phone support, free domain name and SSL certificates for as long as you remain a MochaHost customer, a website builder with 500 free templates (and a service that will custom-design your site if you need) and a site migration service. In addition, all plans are e-commerce ready and come with free shopping cart software.
While it doesn’t cost a penny, we’re adamant on keeping our free hosting sharp and up-to-date. Our Free shared web hosting is based on Apache, PHP, and MySQL. If you’ve been searching for a free hosting platform that supports both legacy and the newest PHP applications, stop looking. We support multiple PHP 5 versions, as well as the newest of PHP 7 to ensure maximum compatibility with anything you need!
In particular, Web Hosting Hub uses BoldGrid as a site builder. BoldGrid is actually an add-on to WordPress, so there's no lock-in. This overcomes the major problem of most site builders: you're locked into that host and that tool, often requiring you to completely rebuild your site if you want to expand. By using a WordPress-based solution, all of the rather considerable power of WordPress is available for future expansion.
16. JustHostJustHost‘s functionality revolves around one main idea: eliminating all complexity attached to the creation and maintenance of a website, and making the experience enjoyable for all users. It encompasses tools to manage your entire online journey, from launching and managing a website to advertising on it and earning money from and around your content. As soon as your site goes live, JustHost ensures you can promote it on Google, Bing, and MOJO marketplaces, and download hundreds of apps and plugins that could be useful to your business. JustHost also specializes in app hosting for WordPress, Drupal, and Joomla sites, and offers cPanel and VPS packages. 
Some domain name registries, often called network information centers (NIC), also function as registrars to end-users. The major generic top-level domain registries, such as for the com, net, org, info domains and others, use a registry-registrar model consisting of hundreds of domain name registrars (see lists at ICANN[21] or VeriSign).[22] In this method of management, the registry only manages the domain name database and the relationship with the registrars. The registrants (users of a domain name) are customers of the registrar, in some cases through additional layers of resellers.
People often think that a web host is the main cause of a slow website but, this is often not the case. When picking a provider, it's important for find a hosting provider that is close to your users and has a good amount of RAM and fast CPU power. Beyond that, it's often the way the website is set up that slows it down for users. To ensure that your website speed is optimal for users you need to make sure you pay attention to the following:
To host a website on the internet, an individual or company would need their own computer or server.[7] As not all companies had the budget or expertise to do this, web hosting services began to offer to host users' websites on their own servers, without the client needing to own the necessary infrastructure required to operate the website. The owners of the websites, also called webmasters, would be able to create a website that would be hosted on the web hosting service's server and published to the web by the web hosting service.
15. GreenGeeksIf you’re committed to renewable energy, you should give GreenGeeks a look. The hosting platform claims to be the cleanest hosting around, backed by 300% Renewable Energy Commitment. For prices as low as $3.95/month, users get unlimited space, transfer, email + free domain, and marketing services, which also make GreenGeeks one of the most compact, do-it-all hosting solutions on the market. You can acquire a Reseller package and manage multiple cPanel hosting accounts, request VPS hosting with dedicated resources and flexibility (and no additional expenses), or get an entire Dedicated server for extreme performance and flexibility. Next to cPanel, app hosting is also available for WordPress, Drupal, Joomla, and CMS. 
We've had our site hosted by Doteasy for years now. Their tech support team is super helpful when we come across issues with our site and were there to walk us through the necessary steps when we decided to migrate to a business plan in line with our site's growing amount of visitors. They're a great company to do business with. Working with a local company also means not having to deal with different time zones and long-distance call costs.
A handful of domains will have restrictions on them, which means you can only purchase them if you meet or exceed certain criteria or have authorization (some examples are .gov, .edu and .mil). But most extensions are available to everyone. In fact, most country code Top Level Domains (ccTLDs) are available for anyone to purchase, even if you don't reside in the country code in question.
Domain names are formed by the rules and procedures of the Domain Name System (DNS). Any name registered in the DNS is a domain name. Domain names are organized in subordinate levels (subdomains) of the DNS root domain, which is nameless. The first-level set of domain names are the top-level domains (TLDs), including the generic top-level domains (gTLDs), such as the prominent domains com, info, net, edu, and org, and the country code top-level domains (ccTLDs). Below these top-level domains in the DNS hierarchy are the second-level and third-level domain names that are typically open for reservation by end-users who wish to connect local area networks to the Internet, create other publicly accessible Internet resources or run web sites.
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