The name invalid is reserved by the Internet Engineering Task Force (IETF) in RFC 2606 (June 1999) as a domain name that may not be installed as a top-level domain in the Domain Name System (DNS) of the Internet.
In 1999, the Internet Engineering Task Force reserved the DNS labels example, invalid, localhost, and test so that they may not be installed into the root zone of the Domain Name System.
The reasons for reservation of these top-level domain names is to reduce the likelihood of conflict and confusion. This allows the use of these names for either documentation purposes or in local testing scenarios.
This top-level domain is sometimes used as a pseudo domain name in Uniform Resource Identifiers (URIs) to convey either an error condition or in use of privacy protection. A notable instance of this usage is in the Session Initiation Protocol (SIP) where the domain name anonymous.invalid in a SIP URI indicates hiding of a caller's identity.
Invalid may refer to:
As the opposite of valid:
I Don't Believe That We Can Conceive
Of An Afterlife That's Meant To Be Perceived
Catastrophes, Calamities, Catastrophe
Everyone Loves A Tragedy
But There's Guns, There's Guns Guns Guns
Pointed At Our Head Every Time We Close Our Eyes
But What Are We, Little Folk
To Do About This Bakery Full Of Lies
We Don't Need No One To Turn Out The Lights For Us
When We Go To Sleep
Catastrophes, Calamities In Our Dreams
When We Dream We Like To Dream About Tragedy And Afterlife
A Perceived Reality, A Tragedy, A Catastrophe
Seems My Life Is Only Just Pretend
And Dreams Are Only What You Make Of Them
And Themes Are Reoccurring So Often
If I Were Wise I'd See A Trend
We Don't Need No One To Turn Out The Lights For Us
Arguing Things That Have Never Been Said
The Mail Was Empty, The Books Were Unread
Progress Hindered By Arrogance
Inquiries Made In Present Tense
Future Stars Will Be Twice As Dense As Ours
Twice As Dense As Ours
Repetition Shoved Down My Throat
Answers Given By Anecdote
Crueler Sonnets Were Never Wrote At All
Never Wrote At All
And It Seems My Life Is Only Just Pretend
And Dreams Are Only What You Make Of Them
And Themes Are Reoccurring So Often
If I Were Wise I'd See A Trend
One, Two, Three, Four
Progress Hindered By Arrogance
Inquiries Made In Present Tense
Future Stars Will Be Twice As Dense As Ours
Twice As Dense As Ours
We Don't Need No One To Turn Out The Lights For Us
Arguing Things That Have Never Been Said
The Mail Was Empty, The Books Were Unread
We Don't Need No One To Turn Out The Lights For Us
How Can You Sleep At A Time Like This
The Answer Was Pointless, The Question Amiss
To Err While Conscious The Words A Mistake