IPRangeExplorer

0.251.18.0/25

Public

Class A — /25 prefix — 126 usable hosts

Network Address
0.251.18.0
Broadcast Address
0.251.18.127
Subnet Mask
255.255.255.128
Usable Hosts
126
First Usable IP
0.251.18.1
Last Usable IP
0.251.18.126
Total IPs
128
Prefix Length
/25

Network address — the base address of the block (0.251.18.0). All devices in this subnet share this prefix. Cannot be assigned to a host.

Broadcast address — packets sent to 0.251.18.127 are delivered to every device in the subnet. Also reserved — not assignable.

Usable hosts — the 126 addresses between those two that you can assign to servers, VMs, or interfaces.

Subnet mask — 255.255.255.128 is the dotted-decimal equivalent of /25. Older tools and Cisco configs use this format instead of CIDR slash notation.

Full Details

CIDR Notation 0.251.18.0/25
Network Address 0.251.18.0
Broadcast Address 0.251.18.127
Subnet Mask 255.255.255.128
Wildcard Mask 0.0.0.127
Prefix Length /25
IP Address Class Class A
Total IP Addresses 128
Usable Host Addresses 126
First Usable IP 0.251.18.1
Last Usable IP 0.251.18.126
Network (Hex) 0x00FB1200
Broadcast (Hex) 0x00FB127F
Address Type Public / Globally Routable

Binary Representation

Network Address
00000000.11111011.00010010 00000000.11111011.00010010.00000000
Subnet Mask
11111111.11111111.11111111.10000000

The first 25 bits (1s in the mask) identify the network. The remaining 7 bits identify hosts within the network.

Split into Equal Subnets

Split 0.251.18.0/25 into 2 equal /26 subnets (62 usable hosts each).

# CIDR Network First Usable Last Usable Broadcast Hosts
1 0.251.18.0/26 0.251.18.0 0.251.18.1 0.251.18.62 0.251.18.63 62
2 0.251.18.64/26 0.251.18.64 0.251.18.65 0.251.18.126 0.251.18.127 62

IP Address Sample

Showing first 16 of 128 total IPs.

0.251.18.0 net
0.251.18.1
0.251.18.2
0.251.18.3
0.251.18.4
0.251.18.5
0.251.18.6
0.251.18.7
0.251.18.8
0.251.18.9
0.251.18.10
0.251.18.11
0.251.18.12
0.251.18.13
0.251.18.14
0.251.18.15
… 112 more IPs …

/25 Subnet Reference

Total IPs 128
Usable Hosts 126
Subnet Mask 255.255.255.128
Wildcard 0.0.0.127
Full /25 reference →

Related Ranges

Parent /24 block 0.251.18.0/24 Sibling /25 block 0.251.18.128/25

Adjacent Prefix Sizes

/23 510 hosts /24 254 hosts /25 126 hosts /26 62 hosts /27 30 hosts

Calculate Another