222.223.128.0/17

Public

Class C — /17 prefix — 32,766 usable hosts

Network Address

222.223.128.0

Broadcast Address

222.223.255.255

Subnet Mask

255.255.128.0

Usable Hosts

32,766

First Usable IP

222.223.128.1

Last Usable IP

222.223.255.254

Total IPs

32,768

Prefix Length

/17

Network address — the base address of the block (222.223.128.0). All devices in this subnet share this prefix. Cannot be assigned to a host.

Broadcast address — packets sent to 222.223.255.255 are delivered to every device in the subnet. Also reserved — not assignable.

Usable hosts — the 32,766 addresses between those two that you can assign to servers, VMs, or interfaces.

Subnet mask — 255.255.128.0 is the dotted-decimal equivalent of /17. Older tools and Cisco configs use this format instead of CIDR slash notation.

Full Details

CIDR Notation	222.223.128.0/17
Network Address	222.223.128.0
Broadcast Address	222.223.255.255
Subnet Mask	255.255.128.0
Wildcard Mask	0.0.127.255
Prefix Length	/17
IP Address Class	Class C
Total IP Addresses	32,768
Usable Host Addresses	32,766
First Usable IP	222.223.128.1
Last Usable IP	222.223.255.254
Network (Hex)	0xDEDF8000
Broadcast (Hex)	0xDEDFFFFF
Address Type	Public / Globally Routable

Binary Representation

Network Address

11011110.11011111 11011110.11011111.10000000.00000000

Subnet Mask

11111111.11111111.10000000.00000000

The first 17 bits (1s in the mask) identify the network. The remaining 15 bits identify hosts within the network.

Split into Equal Subnets

Split 222.223.128.0/17 into 2 equal /18 subnets (16,382 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	222.223.128.0/18	222.223.128.0	222.223.128.1	222.223.191.254	222.223.191.255	16,382
2	222.223.192.0/18	222.223.192.0	222.223.192.1	222.223.255.254	222.223.255.255	16,382

Split 222.223.128.0/17 into 4 equal /19 subnets (8,190 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	222.223.128.0/19	222.223.128.0	222.223.128.1	222.223.159.254	222.223.159.255	8,190
2	222.223.160.0/19	222.223.160.0	222.223.160.1	222.223.191.254	222.223.191.255	8,190
3	222.223.192.0/19	222.223.192.0	222.223.192.1	222.223.223.254	222.223.223.255	8,190
4	222.223.224.0/19	222.223.224.0	222.223.224.1	222.223.255.254	222.223.255.255	8,190

Split 222.223.128.0/17 into 8 equal /20 subnets (4,094 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	222.223.128.0/20	222.223.128.0	222.223.128.1	222.223.143.254	222.223.143.255	4,094
2	222.223.144.0/20	222.223.144.0	222.223.144.1	222.223.159.254	222.223.159.255	4,094
3	222.223.160.0/20	222.223.160.0	222.223.160.1	222.223.175.254	222.223.175.255	4,094
4	222.223.176.0/20	222.223.176.0	222.223.176.1	222.223.191.254	222.223.191.255	4,094
5	222.223.192.0/20	222.223.192.0	222.223.192.1	222.223.207.254	222.223.207.255	4,094
6	222.223.208.0/20	222.223.208.0	222.223.208.1	222.223.223.254	222.223.223.255	4,094
7	222.223.224.0/20	222.223.224.0	222.223.224.1	222.223.239.254	222.223.239.255	4,094
8	222.223.240.0/20	222.223.240.0	222.223.240.1	222.223.255.254	222.223.255.255	4,094

Split 222.223.128.0/17 into 16 equal /21 subnets (2,046 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	222.223.128.0/21	222.223.128.0	222.223.128.1	222.223.135.254	222.223.135.255	2,046
2	222.223.136.0/21	222.223.136.0	222.223.136.1	222.223.143.254	222.223.143.255	2,046
3	222.223.144.0/21	222.223.144.0	222.223.144.1	222.223.151.254	222.223.151.255	2,046
4	222.223.152.0/21	222.223.152.0	222.223.152.1	222.223.159.254	222.223.159.255	2,046
5	222.223.160.0/21	222.223.160.0	222.223.160.1	222.223.167.254	222.223.167.255	2,046
6	222.223.168.0/21	222.223.168.0	222.223.168.1	222.223.175.254	222.223.175.255	2,046
7	222.223.176.0/21	222.223.176.0	222.223.176.1	222.223.183.254	222.223.183.255	2,046
8	222.223.184.0/21	222.223.184.0	222.223.184.1	222.223.191.254	222.223.191.255	2,046
9	222.223.192.0/21	222.223.192.0	222.223.192.1	222.223.199.254	222.223.199.255	2,046
10	222.223.200.0/21	222.223.200.0	222.223.200.1	222.223.207.254	222.223.207.255	2,046
11	222.223.208.0/21	222.223.208.0	222.223.208.1	222.223.215.254	222.223.215.255	2,046
12	222.223.216.0/21	222.223.216.0	222.223.216.1	222.223.223.254	222.223.223.255	2,046
13	222.223.224.0/21	222.223.224.0	222.223.224.1	222.223.231.254	222.223.231.255	2,046
14	222.223.232.0/21	222.223.232.0	222.223.232.1	222.223.239.254	222.223.239.255	2,046
15	222.223.240.0/21	222.223.240.0	222.223.240.1	222.223.247.254	222.223.247.255	2,046
16	222.223.248.0/21	222.223.248.0	222.223.248.1	222.223.255.254	222.223.255.255	2,046

/17 Subnet Reference

Total IPs 32,768

Usable Hosts 32,766

Subnet Mask 255.255.128.0

Wildcard 0.0.127.255

Full /17 reference →

Related Ranges

Parent /16 block 222.223.0.0/16 Sibling /17 block 222.223.0.0/17

Adjacent Prefix Sizes

/15 131,070 hosts /16 65,534 hosts /17 32,766 hosts /18 16,382 hosts /19 8,190 hosts