159.152.32.0/21

Public

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

Network Address

159.152.32.0

Broadcast Address

159.152.39.255

Subnet Mask

255.255.248.0

Usable Hosts

2,046

First Usable IP

159.152.32.1

Last Usable IP

159.152.39.254

Total IPs

2,048

Prefix Length

/21

Network address — the base address of the block (159.152.32.0). All devices in this subnet share this prefix. Cannot be assigned to a host.

Broadcast address — packets sent to 159.152.39.255 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	159.152.32.0/21
Network Address	159.152.32.0
Broadcast Address	159.152.39.255
Subnet Mask	255.255.248.0
Wildcard Mask	0.0.7.255
Prefix Length	/21
IP Address Class	Class B
Total IP Addresses	2,048
Usable Host Addresses	2,046
First Usable IP	159.152.32.1
Last Usable IP	159.152.39.254
Network (Hex)	0x9F982000
Broadcast (Hex)	0x9F9827FF
Address Type	Public / Globally Routable

Binary Representation

Network Address

10011111.10011000 10011111.10011000.00100000.00000000

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 159.152.32.0/21 into 2 equal /22 subnets (1,022 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	159.152.32.0/22	159.152.32.0	159.152.32.1	159.152.35.254	159.152.35.255	1,022
2	159.152.36.0/22	159.152.36.0	159.152.36.1	159.152.39.254	159.152.39.255	1,022

Split 159.152.32.0/21 into 4 equal /23 subnets (510 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	159.152.32.0/23	159.152.32.0	159.152.32.1	159.152.33.254	159.152.33.255	510
2	159.152.34.0/23	159.152.34.0	159.152.34.1	159.152.35.254	159.152.35.255	510
3	159.152.36.0/23	159.152.36.0	159.152.36.1	159.152.37.254	159.152.37.255	510
4	159.152.38.0/23	159.152.38.0	159.152.38.1	159.152.39.254	159.152.39.255	510

Split 159.152.32.0/21 into 8 equal /24 subnets (254 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	159.152.32.0/24	159.152.32.0	159.152.32.1	159.152.32.254	159.152.32.255	254
2	159.152.33.0/24	159.152.33.0	159.152.33.1	159.152.33.254	159.152.33.255	254
3	159.152.34.0/24	159.152.34.0	159.152.34.1	159.152.34.254	159.152.34.255	254
4	159.152.35.0/24	159.152.35.0	159.152.35.1	159.152.35.254	159.152.35.255	254
5	159.152.36.0/24	159.152.36.0	159.152.36.1	159.152.36.254	159.152.36.255	254
6	159.152.37.0/24	159.152.37.0	159.152.37.1	159.152.37.254	159.152.37.255	254
7	159.152.38.0/24	159.152.38.0	159.152.38.1	159.152.38.254	159.152.38.255	254
8	159.152.39.0/24	159.152.39.0	159.152.39.1	159.152.39.254	159.152.39.255	254

Split 159.152.32.0/21 into 16 equal /25 subnets (126 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	159.152.32.0/25	159.152.32.0	159.152.32.1	159.152.32.126	159.152.32.127	126
2	159.152.32.128/25	159.152.32.128	159.152.32.129	159.152.32.254	159.152.32.255	126
3	159.152.33.0/25	159.152.33.0	159.152.33.1	159.152.33.126	159.152.33.127	126
4	159.152.33.128/25	159.152.33.128	159.152.33.129	159.152.33.254	159.152.33.255	126
5	159.152.34.0/25	159.152.34.0	159.152.34.1	159.152.34.126	159.152.34.127	126
6	159.152.34.128/25	159.152.34.128	159.152.34.129	159.152.34.254	159.152.34.255	126
7	159.152.35.0/25	159.152.35.0	159.152.35.1	159.152.35.126	159.152.35.127	126
8	159.152.35.128/25	159.152.35.128	159.152.35.129	159.152.35.254	159.152.35.255	126
9	159.152.36.0/25	159.152.36.0	159.152.36.1	159.152.36.126	159.152.36.127	126
10	159.152.36.128/25	159.152.36.128	159.152.36.129	159.152.36.254	159.152.36.255	126
11	159.152.37.0/25	159.152.37.0	159.152.37.1	159.152.37.126	159.152.37.127	126
12	159.152.37.128/25	159.152.37.128	159.152.37.129	159.152.37.254	159.152.37.255	126
13	159.152.38.0/25	159.152.38.0	159.152.38.1	159.152.38.126	159.152.38.127	126
14	159.152.38.128/25	159.152.38.128	159.152.38.129	159.152.38.254	159.152.38.255	126
15	159.152.39.0/25	159.152.39.0	159.152.39.1	159.152.39.126	159.152.39.127	126
16	159.152.39.128/25	159.152.39.128	159.152.39.129	159.152.39.254	159.152.39.255	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 159.152.32.0/20 Sibling /21 block 159.152.40.0/21

Adjacent Prefix Sizes

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