18.69.64.0/20

Public

Class A — /20 prefix — 4,094 usable hosts

Network Address

18.69.64.0

Broadcast Address

18.69.79.255

Subnet Mask

255.255.240.0

Usable Hosts

4,094

First Usable IP

18.69.64.1

Last Usable IP

18.69.79.254

Total IPs

4,096

Prefix Length

/20

Network address — the base address of the block (18.69.64.0). All devices in this subnet share this prefix. Cannot be assigned to a host.

Broadcast address — packets sent to 18.69.79.255 are delivered to every device in the subnet. Also reserved — not assignable.

Usable hosts — the 4,094 addresses between those two that you can assign to servers, VMs, or interfaces.

Subnet mask — 255.255.240.0 is the dotted-decimal equivalent of /20. Older tools and Cisco configs use this format instead of CIDR slash notation.

Full Details

CIDR Notation	18.69.64.0/20
Network Address	18.69.64.0
Broadcast Address	18.69.79.255
Subnet Mask	255.255.240.0
Wildcard Mask	0.0.15.255
Prefix Length	/20
IP Address Class	Class A
Total IP Addresses	4,096
Usable Host Addresses	4,094
First Usable IP	18.69.64.1
Last Usable IP	18.69.79.254
Network (Hex)	0x12454000
Broadcast (Hex)	0x12454FFF
Address Type	Public / Globally Routable

Binary Representation

Network Address

00010010.01000101 00010010.01000101.01000000.00000000

Subnet Mask

11111111.11111111.11110000.00000000

The first 20 bits (1s in the mask) identify the network. The remaining 12 bits identify hosts within the network.

Split into Equal Subnets

Split 18.69.64.0/20 into 2 equal /21 subnets (2,046 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	18.69.64.0/21	18.69.64.0	18.69.64.1	18.69.71.254	18.69.71.255	2,046
2	18.69.72.0/21	18.69.72.0	18.69.72.1	18.69.79.254	18.69.79.255	2,046

Split 18.69.64.0/20 into 4 equal /22 subnets (1,022 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	18.69.64.0/22	18.69.64.0	18.69.64.1	18.69.67.254	18.69.67.255	1,022
2	18.69.68.0/22	18.69.68.0	18.69.68.1	18.69.71.254	18.69.71.255	1,022
3	18.69.72.0/22	18.69.72.0	18.69.72.1	18.69.75.254	18.69.75.255	1,022
4	18.69.76.0/22	18.69.76.0	18.69.76.1	18.69.79.254	18.69.79.255	1,022

Split 18.69.64.0/20 into 8 equal /23 subnets (510 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	18.69.64.0/23	18.69.64.0	18.69.64.1	18.69.65.254	18.69.65.255	510
2	18.69.66.0/23	18.69.66.0	18.69.66.1	18.69.67.254	18.69.67.255	510
3	18.69.68.0/23	18.69.68.0	18.69.68.1	18.69.69.254	18.69.69.255	510
4	18.69.70.0/23	18.69.70.0	18.69.70.1	18.69.71.254	18.69.71.255	510
5	18.69.72.0/23	18.69.72.0	18.69.72.1	18.69.73.254	18.69.73.255	510
6	18.69.74.0/23	18.69.74.0	18.69.74.1	18.69.75.254	18.69.75.255	510
7	18.69.76.0/23	18.69.76.0	18.69.76.1	18.69.77.254	18.69.77.255	510
8	18.69.78.0/23	18.69.78.0	18.69.78.1	18.69.79.254	18.69.79.255	510

Split 18.69.64.0/20 into 16 equal /24 subnets (254 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	18.69.64.0/24	18.69.64.0	18.69.64.1	18.69.64.254	18.69.64.255	254
2	18.69.65.0/24	18.69.65.0	18.69.65.1	18.69.65.254	18.69.65.255	254
3	18.69.66.0/24	18.69.66.0	18.69.66.1	18.69.66.254	18.69.66.255	254
4	18.69.67.0/24	18.69.67.0	18.69.67.1	18.69.67.254	18.69.67.255	254
5	18.69.68.0/24	18.69.68.0	18.69.68.1	18.69.68.254	18.69.68.255	254
6	18.69.69.0/24	18.69.69.0	18.69.69.1	18.69.69.254	18.69.69.255	254
7	18.69.70.0/24	18.69.70.0	18.69.70.1	18.69.70.254	18.69.70.255	254
8	18.69.71.0/24	18.69.71.0	18.69.71.1	18.69.71.254	18.69.71.255	254
9	18.69.72.0/24	18.69.72.0	18.69.72.1	18.69.72.254	18.69.72.255	254
10	18.69.73.0/24	18.69.73.0	18.69.73.1	18.69.73.254	18.69.73.255	254
11	18.69.74.0/24	18.69.74.0	18.69.74.1	18.69.74.254	18.69.74.255	254
12	18.69.75.0/24	18.69.75.0	18.69.75.1	18.69.75.254	18.69.75.255	254
13	18.69.76.0/24	18.69.76.0	18.69.76.1	18.69.76.254	18.69.76.255	254
14	18.69.77.0/24	18.69.77.0	18.69.77.1	18.69.77.254	18.69.77.255	254
15	18.69.78.0/24	18.69.78.0	18.69.78.1	18.69.78.254	18.69.78.255	254
16	18.69.79.0/24	18.69.79.0	18.69.79.1	18.69.79.254	18.69.79.255	254

/20 Subnet Reference

Total IPs 4,096

Usable Hosts 4,094

Subnet Mask 255.255.240.0

Wildcard 0.0.15.255

Full /20 reference →

Related Ranges

Parent /19 block 18.69.64.0/19 Sibling /20 block 18.69.80.0/20

Adjacent Prefix Sizes

/18 16,382 hosts /19 8,190 hosts /20 4,094 hosts /21 2,046 hosts /22 1,022 hosts