IPRangeExplorer

201.66.232.0/21

Public

Class C — /21 prefix — 2,046 usable hosts

Network Address
201.66.232.0
Broadcast Address
201.66.239.255
Subnet Mask
255.255.248.0
Usable Hosts
2,046
First Usable IP
201.66.232.1
Last Usable IP
201.66.239.254
Total IPs
2,048
Prefix Length
/21

Network address — the base address of the block (201.66.232.0). All devices in this subnet share this prefix. Cannot be assigned to a host.

Broadcast address — packets sent to 201.66.239.255 are delivered to every device in the subnet. Also reserved — not assignable.

Usable hosts — the 2,046 addresses between those two that you can assign to servers, VMs, or interfaces.

Subnet mask — 255.255.248.0 is the dotted-decimal equivalent of /21. Older tools and Cisco configs use this format instead of CIDR slash notation.

Full Details

CIDR Notation 201.66.232.0/21
Network Address 201.66.232.0
Broadcast Address 201.66.239.255
Subnet Mask 255.255.248.0
Wildcard Mask 0.0.7.255
Prefix Length /21
IP Address Class Class C
Total IP Addresses 2,048
Usable Host Addresses 2,046
First Usable IP 201.66.232.1
Last Usable IP 201.66.239.254
Network (Hex) 0xC942E800
Broadcast (Hex) 0xC942EFFF
Address Type Public / Globally Routable

Binary Representation

Network Address
11001001.01000010 11001001.01000010.11101000.00000000
Subnet Mask
11111111.11111111.11111000.00000000

The first 21 bits (1s in the mask) identify the network. The remaining 11 bits identify hosts within the network.

Split into Equal Subnets

Split 201.66.232.0/21 into 2 equal /22 subnets (1,022 usable hosts each).

# CIDR Network First Usable Last Usable Broadcast Hosts
1 201.66.232.0/22 201.66.232.0 201.66.232.1 201.66.235.254 201.66.235.255 1,022
2 201.66.236.0/22 201.66.236.0 201.66.236.1 201.66.239.254 201.66.239.255 1,022

/21 Subnet Reference

Total IPs 2,048
Usable Hosts 2,046
Subnet Mask 255.255.248.0
Wildcard 0.0.7.255
Full /21 reference →

Related Ranges

Parent /20 block 201.66.224.0/20 Sibling /21 block 201.66.224.0/21

Adjacent Prefix Sizes

/19 8,190 hosts /20 4,094 hosts /21 2,046 hosts /22 1,022 hosts /23 510 hosts

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