The remaining few current generation of IP Version 4 (IPv4) web addresses are running dry as the central pool drops down to its last block of 16 million each.
The BBC reports that, early this morning, the organisation managing web addresses in the Asia Pacific region made a request for more addresses. When these are passed on there will only be five blocks of 16 million addresses each left.
IPv4 was created in the 1970s and originally had room for 4.3 billion addresses, although the rapid growth of the Internet has meant that these have quickly been used up. The final addresses expected to be allocated by September 2011.
The last five blocks of IPv4 are to be handed over to regional agencies in a ceremony in mid-March.
Companies have been forced to take up IPv6, a new system that has trillions of addresses available to use, although uptake has been slow so far.
It was announced recently that UK ISP AAISP plans to automatically allocate new users with an IPv6 address, having only allowed users to opt in for them previously.