Sign up. Term of the Day. Best of Techopedia weekly. News and Special Offers occasional. By Techopedia Staff Last updated: July 2, Web Services Internet Hosting. Written by Techopedia Staff. IT Careers. Tech moves fast! Stay ahead of the curve with Techopedia! Do you verify that? The best way to explain the differences between these different items—that are related but different—is to break it down by example.
Think of networks like a tree:. This computer name is simply the name I have assigned my local machine. Nobody outside of my LAN will know this computer name; this is strictly a local setting.
As Wikipedia explains ; emphasis is mine:. In computer networking, a hostname archaically nodename is a label that is assigned to a device connected to a computer network and that is used to identify the device in various forms of electronic communication such as the World Wide Web, e-mail or Usenet. Again, as Wikipedia explains ; emphasis is mine:. A fully qualified domain name FQDN , sometimes also referred to as an absolute domain name, is a domain name that specifies its exact location in the tree hierarchy of the Domain Name System DNS.
It specifies all domain levels, including the top-level domain and the root zone. A fully qualified domain name is distinguished by its lack of ambiguity: it can be interpreted only in one way. And mainly in an academic context.
So there would be a place like whattsamattau. Nowadays, everyone—and seemingly everything in the world—has a website. And many people just register domains just for the web service. So the historic convention of www is discarded in many cases. Many people have websites without www but will still have accommodations to redirect www traffic to the main, non- www hostname.
But technically speaking, www can still be considered a hostname. So in my example of jakegould. Yet again, as Wikipedia explains ; emphasis is mine:. Now after drafting all of this, it can be confusing. Many computer names are hostnames are fully-qualified domain names and in some cases they could be subdomains.
So in my opinion, many uses of these terms are synonymous. The en. The en in the en. And en. Meaning the en itself is semantically considered a subdomain, but it is also a hostname because there is a host computer connected to the IP address connected to en.
So knowing that mail. If you ping fakename. If that ping dies—which it most likely will since it is fake—that means that the host is down or it does not exist. If it dies with an IP address connected to it, that would mean the hostname fakename.
Yes, this can all be confusing. Hostname is an attribute of a system stored locally on that system. A subdomain is a DNS concept. In DNS, domain names domains for short can be authoritative or non-authoritative - if they are non-authoritative, that means another server "handles" that domain. So in a domain such as www. Your system might keep track of the domain it thinks it's on as well as a locally managed hostname. Take our short survey. Stack Overflow for Teams — Collaborate and share knowledge with a private group.
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Let me use www. Python script I used: import socket for host in ["www. Here is what I got when I run host One machine two FQDN, how does it work?
What you're actually asking us to do is help explain how socket API calls map to DNS related terminology, which requires us to cite Python's documentation - making this an off-topic programming question. StackOverflow Further, 4 is related to how Google's webserver running on that IP address processes different Hostname headers sent by the web browser.
Alnitak Would you be interested in handling this question over on Stack Overflow? I wouldn't be able to dissect this one without having to reference Python documentation to explain what the calls are actually doing, so I think this pretty squarely belongs on SO.
AndrewB I just updated the post on StackOverflow to match this post, so they are exactly the same now. Add a comment. Active Oldest Votes. Community Bot 1 1 1 silver badge. Esa Jokinen Esa Jokinen 2 2 silver badges 9 9 bronze badges.
Calle Dybedahl Calle Dybedahl 4, 2 2 gold badges 16 16 silver badges 22 22 bronze badges. Again, this can vary between systems and libraries. David David 1 1 bronze badge. Sign up or log in Sign up using Google. Sign up using Facebook.
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