IPv4 subnet
0.0.0.128/25
- IPv4
- This network
- /25
- 126 hosts
0.0.0.128/25 is an IPv4 subnet of 128 addresses, of which 126 are usable hosts. Its network address is 0.0.0.128, its broadcast address is 0.0.0.255, and its subnet mask is 255.255.255.128. The block is this network: RFC 1122, only valid as a source address.
Address
00000000000000000000000010000000
Dotted decimal0.0.0.128
32-bit integer128
Hexadecimal0x00000080
Binary00000000.00000000.00000000.10000000
Octal00.00.00.0200
Octets1: 0 · 2: 0 · 3: 0 · 4: 128
Reverse DNS name128.0.0.0.in-addr.arpa
IPv4-mapped IPv6::ffff:0.0.0.128
IPv6 compact form::ffff:0:80
Subnet 0.0.0.128/25
Network address0.0.0.128
Broadcast address0.0.0.255
Subnet mask255.255.255.128
Wildcard mask0.0.0.127the inverse mask, as used in ACLs
Prefix length/25
Total addresses128
Usable hosts126the network and broadcast addresses are not assignable
First usable host0.0.0.129
Last usable host0.0.0.254
Host range0.0.0.129 – 0.0.0.254
Mask in binary11111111.11111111.11111111.10000000
Contains this addressYes
Scope & registry
TypeThis networkRFC 1122, only valid as a source address
Routable on the public internetNo
Legacy classA (/8 by the old classful scheme)classful addressing was replaced by CIDR in 1993; shown for reference only
LoopbackNo
MulticastNo
Safe to use in documentationNo
Related prefixes
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