IPRangeExplorer

208.252.0.0/21

Public

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

Network Address
208.252.0.0
Broadcast Address
208.252.7.255
Subnet Mask
255.255.248.0
Usable Hosts
2,046
First Usable IP
208.252.0.1
Last Usable IP
208.252.7.254
Total IPs
2,048
Prefix Length
/21

Network address — the base address of the block (208.252.0.0). All devices in this subnet share this prefix. Cannot be assigned to a host.

Broadcast address — packets sent to 208.252.7.255 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 208.252.0.0/21
Network Address 208.252.0.0
Broadcast Address 208.252.7.255
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 208.252.0.1
Last Usable IP 208.252.7.254
Network (Hex) 0xD0FC0000
Broadcast (Hex) 0xD0FC07FF
Address Type Public / Globally Routable

Binary Representation

Network Address
11010000.11111100 11010000.11111100.00000000.00000000
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 208.252.0.0/21 into 2 equal /22 subnets (1,022 usable hosts each).

# CIDR Network First Usable Last Usable Broadcast Hosts
1 208.252.0.0/22 208.252.0.0 208.252.0.1 208.252.3.254 208.252.3.255 1,022
2 208.252.4.0/22 208.252.4.0 208.252.4.1 208.252.7.254 208.252.7.255 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 208.252.0.0/20 Sibling /21 block 208.252.8.0/21

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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