200.52.16.0/21

Public

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

Network Address

200.52.16.0

Broadcast Address

200.52.23.255

Subnet Mask

255.255.248.0

Usable Hosts

2,046

First Usable IP

200.52.16.1

Last Usable IP

200.52.23.254

Total IPs

2,048

Prefix Length

/21

Network address — the base address of the block (200.52.16.0). All devices in this subnet share this prefix. Cannot be assigned to a host.

Broadcast address — packets sent to 200.52.23.255 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	200.52.16.0/21
Network Address	200.52.16.0
Broadcast Address	200.52.23.255
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	200.52.16.1
Last Usable IP	200.52.23.254
Network (Hex)	0xC8341000
Broadcast (Hex)	0xC83417FF
Address Type	Public / Globally Routable

Binary Representation

Network Address

11001000.00110100 11001000.00110100.00010000.00000000

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 200.52.16.0/21 into 2 equal /22 subnets (1,022 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	200.52.16.0/22	200.52.16.0	200.52.16.1	200.52.19.254	200.52.19.255	1,022
2	200.52.20.0/22	200.52.20.0	200.52.20.1	200.52.23.254	200.52.23.255	1,022

Split 200.52.16.0/21 into 4 equal /23 subnets (510 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	200.52.16.0/23	200.52.16.0	200.52.16.1	200.52.17.254	200.52.17.255	510
2	200.52.18.0/23	200.52.18.0	200.52.18.1	200.52.19.254	200.52.19.255	510
3	200.52.20.0/23	200.52.20.0	200.52.20.1	200.52.21.254	200.52.21.255	510
4	200.52.22.0/23	200.52.22.0	200.52.22.1	200.52.23.254	200.52.23.255	510

Split 200.52.16.0/21 into 8 equal /24 subnets (254 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	200.52.16.0/24	200.52.16.0	200.52.16.1	200.52.16.254	200.52.16.255	254
2	200.52.17.0/24	200.52.17.0	200.52.17.1	200.52.17.254	200.52.17.255	254
3	200.52.18.0/24	200.52.18.0	200.52.18.1	200.52.18.254	200.52.18.255	254
4	200.52.19.0/24	200.52.19.0	200.52.19.1	200.52.19.254	200.52.19.255	254
5	200.52.20.0/24	200.52.20.0	200.52.20.1	200.52.20.254	200.52.20.255	254
6	200.52.21.0/24	200.52.21.0	200.52.21.1	200.52.21.254	200.52.21.255	254
7	200.52.22.0/24	200.52.22.0	200.52.22.1	200.52.22.254	200.52.22.255	254
8	200.52.23.0/24	200.52.23.0	200.52.23.1	200.52.23.254	200.52.23.255	254

Split 200.52.16.0/21 into 16 equal /25 subnets (126 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	200.52.16.0/25	200.52.16.0	200.52.16.1	200.52.16.126	200.52.16.127	126
2	200.52.16.128/25	200.52.16.128	200.52.16.129	200.52.16.254	200.52.16.255	126
3	200.52.17.0/25	200.52.17.0	200.52.17.1	200.52.17.126	200.52.17.127	126
4	200.52.17.128/25	200.52.17.128	200.52.17.129	200.52.17.254	200.52.17.255	126
5	200.52.18.0/25	200.52.18.0	200.52.18.1	200.52.18.126	200.52.18.127	126
6	200.52.18.128/25	200.52.18.128	200.52.18.129	200.52.18.254	200.52.18.255	126
7	200.52.19.0/25	200.52.19.0	200.52.19.1	200.52.19.126	200.52.19.127	126
8	200.52.19.128/25	200.52.19.128	200.52.19.129	200.52.19.254	200.52.19.255	126
9	200.52.20.0/25	200.52.20.0	200.52.20.1	200.52.20.126	200.52.20.127	126
10	200.52.20.128/25	200.52.20.128	200.52.20.129	200.52.20.254	200.52.20.255	126
11	200.52.21.0/25	200.52.21.0	200.52.21.1	200.52.21.126	200.52.21.127	126
12	200.52.21.128/25	200.52.21.128	200.52.21.129	200.52.21.254	200.52.21.255	126
13	200.52.22.0/25	200.52.22.0	200.52.22.1	200.52.22.126	200.52.22.127	126
14	200.52.22.128/25	200.52.22.128	200.52.22.129	200.52.22.254	200.52.22.255	126
15	200.52.23.0/25	200.52.23.0	200.52.23.1	200.52.23.126	200.52.23.127	126
16	200.52.23.128/25	200.52.23.128	200.52.23.129	200.52.23.254	200.52.23.255	126

/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 200.52.16.0/20 Sibling /21 block 200.52.24.0/21

Adjacent Prefix Sizes

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