Therefore, directed broadcast on a point-to-point interface is eliminated. The two IP addresses are interpreted as host addresses, and do not require broadcast support because any packet that is transmitted by one host is always received by the other host at the receiving end. ![]() In contrast, a 31-bit subnet mask uses only two IP addresses: all zero bits and all one bits in the host portion of the IP address. With IPv4, four IP addresses with a 30-bit subnet mask are allocated on point-to-point networks. Support for an IPv4 address with a 31-bit subnet mask is described in RFC 3021. To conserve IPv4 address space, a 31-bit subnet mask can be assigned to point-to-point networks. ![]() NOTE 31-bit subnet masks are supported on ICX 7150, ICX 7250, ICX 7450, and ICX 7750 devices running the full Layer 3 image.
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