The only exception is probably the domain name space, where value is attributed to some names.

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"It's the biggest shake up of the domain name space ever, " said Lesley Cowley, chief executive of Nominet which oversees the UK's net addresses.

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For now, however, private space travel remains the domain of billionaires.

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This is the domain of government space agencies.

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As well as providing new internet space, officials in Brussels hope the new domain name will help promote the identity of the EU itself on the electronic media.

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Between them, they bring deep experience in virtually every domain -- land, air, space, sea, cyber.

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However, if it could be done, this quadrant would certainly deliver on the high cost of capital demanded by venture investments in the space: this is high risk, high return domain.

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Specifically, ICANN is responsible for coordinating the assignment of protocol parameters, overseeing the domain name system, allocating IP-address space and managing the root-server system.

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It is common for cyber strategists to refer to cyberspace as a domain like air, land, sea, and space.

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Cyberspace has become the fifth domain of warfare, after land, sea, air and space (see article).

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