248.0.0.0 Subnet Mask
248.0.0.0 is the subnet mask for a /5 network — 134,217,726 usable hosts out of 134,217,728 addresses.
CIDR Prefix
/5
Wildcard Mask
7.255.255.255
Total Addresses
134,217,728
Usable Hosts
134,217,726
Network Bits
5
Host Bits
27
248.0.0.0 in Binary
Each octet is eight bits. The highlighted bits are the 5 network bits; the rest are the 27 host bits that vary within the subnet.
248
0
0
0
Networks Using 248.0.0.0
| Network | Host Range | Broadcast |
|---|---|---|
| 8.0.0.0/5 | 8.0.0.1 – 15.255.255.254 | 15.255.255.255 |
| 168.0.0.0/5 | 168.0.0.1 – 175.255.255.254 | 175.255.255.255 |
| 192.0.0.0/5 | 192.0.0.1 – 199.255.255.254 | 199.255.255.255 |
Neighbouring Masks
Frequently Asked Questions
What CIDR prefix is 248.0.0.0?
248.0.0.0 is /5 in CIDR notation. The mask sets the first 5 of the 32 bits in an IPv4 address to 1, marking them as the network portion, and leaves the remaining 27 bits as 0 for hosts.
How many hosts does 248.0.0.0 allow?
A network with mask 248.0.0.0 holds 134,217,728 addresses, of which 134,217,726 are usable by hosts — the network address and the broadcast address are reserved.
What is the wildcard mask for 248.0.0.0?
The wildcard mask for 248.0.0.0 is 7.255.255.255. It is the bitwise inverse: every 1 in the subnet mask becomes a 0 and every 0 becomes a 1. Cisco access lists and OSPF network statements take the wildcard form rather than the subnet mask.
Standards
- RFC 950 — Internet Standard Subnetting Procedure
Defines the dotted-decimal subnet mask itself, and the rule that the network and broadcast addresses are not assignable to hosts.
- RFC 4632 — Classless Inter-Domain Routing (CIDR)
Establishes the /5 prefix notation that 248.0.0.0 is equivalent to, and requires masks to be contiguous — which is why exactly 33 of the 4.3 billion possible values are valid.