IPRangeExplorer

121.2.132.128/25

Public

Class A — /25 prefix — 126 usable hosts

Network Address
121.2.132.128
Broadcast Address
121.2.132.255
Subnet Mask
255.255.255.128
Usable Hosts
126
First Usable IP
121.2.132.129
Last Usable IP
121.2.132.254
Total IPs
128
Prefix Length
/25

Network address — the base address of the block (121.2.132.128). All devices in this subnet share this prefix. Cannot be assigned to a host.

Broadcast address — packets sent to 121.2.132.255 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 121.2.132.128/25
Network Address 121.2.132.128
Broadcast Address 121.2.132.255
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 121.2.132.129
Last Usable IP 121.2.132.254
Network (Hex) 0x79028480
Broadcast (Hex) 0x790284FF
Address Type Public / Globally Routable

Binary Representation

Network Address
01111001.00000010.10000100 01111001.00000010.10000100.10000000
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 121.2.132.128/25 into 2 equal /26 subnets (62 usable hosts each).

# CIDR Network First Usable Last Usable Broadcast Hosts
1 121.2.132.128/26 121.2.132.128 121.2.132.129 121.2.132.190 121.2.132.191 62
2 121.2.132.192/26 121.2.132.192 121.2.132.193 121.2.132.254 121.2.132.255 62

IP Address Sample

Showing first 16 of 128 total IPs.

121.2.132.128 net
121.2.132.129
121.2.132.130
121.2.132.131
121.2.132.132
121.2.132.133
121.2.132.134
121.2.132.135
121.2.132.136
121.2.132.137
121.2.132.138
121.2.132.139
121.2.132.140
121.2.132.141
121.2.132.142
121.2.132.143
… 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 121.2.132.0/24 Sibling /25 block 121.2.132.0/25

Adjacent Prefix Sizes

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

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