Failover.ca - Registered in 2007:

"In computing, failover is the capability to switch over automatically to a redundant or standby computer server, system, or network upon the failure or abnormal termination of the previously active application, server, system, or network."

About 12,000,000 results on Google for "Failover"

Rsync.ca - Registered in 2008:

"Rsync is a software application for Unix and Windows systems which synchronizes files and directories from one location to another while minimizing data transfer using delta encoding when appropriate."

About 7,570,000 results on Google for "Rsync"

IRCd.ca - Registered in 2010:

"An IRCd, short for Internet Relay Chat daemon, is server software that implements the IRC protocol, enabling people to talk to each other via the Internet (exchanging textual messages in real time)."

About 2,380,000 results on Google for "IRCd"

ICMP.ca - Registered in 2010:

"The Internet Control Message Protocol (ICMP) is one of the core protocols of the Internet Protocol Suite. It is chiefly used by the operating systems of networked computers to send error messages indicating, for example, that a requested service is not available or that a host or router could not be reached."

About 12,600,000 results on Google for "ICMP".

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I'm accepting all reasonable offers on the above individual domains. Please send me a PM to discuss further. The domains are at NamesPro and currently have no traffic. Thanks!