Please explain the ".co" domain extension

curiouswebster used Ask the Experts™
Please explain the ".co" domain extension

What does it mean?


Watch Question

Do more with

Expert Office
EXPERT OFFICE® is a registered trademark of EXPERTS EXCHANGE®
The domain ".co" belongs to Colombia, but could be used by anybody just as alternative to ".com", I guess.
Lucas BishopMarketing Technologist
Officially, .co is the top-level domain extension for Columbia:

However, many businesses use this domain as the "co" abbreviation can just as easily represent (co)mpany.

An underhanded use case is to use this domain to try and get traffic for mis-typed domains. For example, if you owned "" there is a chance you would sometimes get visitors who tried to type out "".
David FavorFractional CTO
Distinguished Expert 2018
Just another TLD (Top Level Domain) relating to the Columbian Geo.

Maybe explain why you care or what other question your seeking to answer.
Ensure you’re charging the right price for your IT

Do you wonder if your IT business is truly profitable or if you should raise your prices? Learn how to calculate your overhead burden using our free interactive tool and use it to determine the right price for your IT services. Start calculating Now!

Top Expert 2016

Commented: is a subdomain of the country TLD UK and Australia. At one time there were only a few Top Level Domains (TLD) now you can literally buy your own.
curiouswebsterSoftware Engineer


I was confused when I saw Google had:

but I guess that is just a sub-domain.

When I go to it re-routes to

So, does this mean is Columbian? Or they just find it neat to say "Create Your Opportunity" as part of their logo?
Top Expert 2016
Any person or entity in the world can register .co domain names
There are no domicile or burdensome documentation requirements
Registration period is between 1 and 5 years, subject to renewal
Registrants can easily transfer domain names

google also owns  
amazon owns and
DNS works backwards when compared to how most English speaking languages read as its right-to-left.
The period/dot is a marker to show where each 'section' ends.

DNS looks at each 'section' and resolves that bit first.

Let's look at an example in detail:
DNS always starts at the right, so .COM is the first bit to be resolved. This is known as the TOP LEVEL DOMAIN (TLD)
DNS checks who owns/looks after all DNS addresses ending with .COM and goes to them.
DNS then checks the next bit: .MYCOMPANY and asks the owners of .COM to resolve that bit to an owner.
DNS then goes to the owners of .MYCOMPANY.COM and asks who owns .MEMBERS
In this example the owners of .MYCOMPANY.COM also own .MEMBERS.MYCOMPANY.COM so they don't refer DNS anywhere and return an IP address instead.

So your query on .CO is simply a reference to all DNS addresses owned by the TOP LEVEL DOMAIN .CO

When DNS was firs created, the TLDs were assigned to specific organisations or countries. This rapidly descended into chaos as everyone wanted to buy TLDs that 'looked cool' rather than TLDs that matched their own country.
These days anyone can own/buy pretty much any DNS entry as long as no-one already owns it :-)
curiouswebsterSoftware Engineer



Do more with

Expert Office
Submit tech questions to Ask the Experts™ at any time to receive solutions, advice, and new ideas from leading industry professionals.

Start 7-Day Free Trial