JSI Tip 4635. You can't name your computer entriely with numbers?

When you try to name your NT 5.0+ (Windows 2000, Windows XP) with a name that consists entirely of numbers, you can't.

NOTE: If you upgraded from a previous operating system with a numeric computer name, the old name is preserved.

The primary reason for this is that some utilities can't distinguish a single-label numeric name from an IP address.

If your computer was named 123, pinging the name 123 would be the same as ping 0.0.0.123.