100.48.0.0/15

Public

Class A — /15 prefix — 131,070 usable hosts

Network Address

100.48.0.0

Broadcast Address

100.49.255.255

Subnet Mask

255.254.0.0

Usable Hosts

131,070

First Usable IP

100.48.0.1

Last Usable IP

100.49.255.254

Total IPs

131,072

Prefix Length

/15

Network address — the base address of the block (100.48.0.0). All devices in this subnet share this prefix. Cannot be assigned to a host.

Broadcast address — packets sent to 100.49.255.255 are delivered to every device in the subnet. Also reserved — not assignable.

Usable hosts — the 131,070 addresses between those two that you can assign to servers, VMs, or interfaces.

Subnet mask — 255.254.0.0 is the dotted-decimal equivalent of /15. Older tools and Cisco configs use this format instead of CIDR slash notation.

Full Details

CIDR Notation	100.48.0.0/15
Network Address	100.48.0.0
Broadcast Address	100.49.255.255
Subnet Mask	255.254.0.0
Wildcard Mask	0.1.255.255
Prefix Length	/15
IP Address Class	Class A
Total IP Addresses	131,072
Usable Host Addresses	131,070
First Usable IP	100.48.0.1
Last Usable IP	100.49.255.254
Network (Hex)	0x64300000
Broadcast (Hex)	0x6431FFFF
Address Type	Public / Globally Routable

Binary Representation

Network Address

01100100 01100100.00110000.00000000.00000000

Subnet Mask

11111111.11111110.00000000.00000000

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

Split into Equal Subnets

Split 100.48.0.0/15 into 2 equal /16 subnets (65,534 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	100.48.0.0/16	100.48.0.0	100.48.0.1	100.48.255.254	100.48.255.255	65,534
2	100.49.0.0/16	100.49.0.0	100.49.0.1	100.49.255.254	100.49.255.255	65,534

Split 100.48.0.0/15 into 4 equal /17 subnets (32,766 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	100.48.0.0/17	100.48.0.0	100.48.0.1	100.48.127.254	100.48.127.255	32,766
2	100.48.128.0/17	100.48.128.0	100.48.128.1	100.48.255.254	100.48.255.255	32,766
3	100.49.0.0/17	100.49.0.0	100.49.0.1	100.49.127.254	100.49.127.255	32,766
4	100.49.128.0/17	100.49.128.0	100.49.128.1	100.49.255.254	100.49.255.255	32,766

Split 100.48.0.0/15 into 8 equal /18 subnets (16,382 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	100.48.0.0/18	100.48.0.0	100.48.0.1	100.48.63.254	100.48.63.255	16,382
2	100.48.64.0/18	100.48.64.0	100.48.64.1	100.48.127.254	100.48.127.255	16,382
3	100.48.128.0/18	100.48.128.0	100.48.128.1	100.48.191.254	100.48.191.255	16,382
4	100.48.192.0/18	100.48.192.0	100.48.192.1	100.48.255.254	100.48.255.255	16,382
5	100.49.0.0/18	100.49.0.0	100.49.0.1	100.49.63.254	100.49.63.255	16,382
6	100.49.64.0/18	100.49.64.0	100.49.64.1	100.49.127.254	100.49.127.255	16,382
7	100.49.128.0/18	100.49.128.0	100.49.128.1	100.49.191.254	100.49.191.255	16,382
8	100.49.192.0/18	100.49.192.0	100.49.192.1	100.49.255.254	100.49.255.255	16,382

Split 100.48.0.0/15 into 16 equal /19 subnets (8,190 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	100.48.0.0/19	100.48.0.0	100.48.0.1	100.48.31.254	100.48.31.255	8,190
2	100.48.32.0/19	100.48.32.0	100.48.32.1	100.48.63.254	100.48.63.255	8,190
3	100.48.64.0/19	100.48.64.0	100.48.64.1	100.48.95.254	100.48.95.255	8,190
4	100.48.96.0/19	100.48.96.0	100.48.96.1	100.48.127.254	100.48.127.255	8,190
5	100.48.128.0/19	100.48.128.0	100.48.128.1	100.48.159.254	100.48.159.255	8,190
6	100.48.160.0/19	100.48.160.0	100.48.160.1	100.48.191.254	100.48.191.255	8,190
7	100.48.192.0/19	100.48.192.0	100.48.192.1	100.48.223.254	100.48.223.255	8,190
8	100.48.224.0/19	100.48.224.0	100.48.224.1	100.48.255.254	100.48.255.255	8,190
9	100.49.0.0/19	100.49.0.0	100.49.0.1	100.49.31.254	100.49.31.255	8,190
10	100.49.32.0/19	100.49.32.0	100.49.32.1	100.49.63.254	100.49.63.255	8,190
11	100.49.64.0/19	100.49.64.0	100.49.64.1	100.49.95.254	100.49.95.255	8,190
12	100.49.96.0/19	100.49.96.0	100.49.96.1	100.49.127.254	100.49.127.255	8,190
13	100.49.128.0/19	100.49.128.0	100.49.128.1	100.49.159.254	100.49.159.255	8,190
14	100.49.160.0/19	100.49.160.0	100.49.160.1	100.49.191.254	100.49.191.255	8,190
15	100.49.192.0/19	100.49.192.0	100.49.192.1	100.49.223.254	100.49.223.255	8,190
16	100.49.224.0/19	100.49.224.0	100.49.224.1	100.49.255.254	100.49.255.255	8,190

/15 Subnet Reference

Total IPs 131,072

Usable Hosts 131,070

Subnet Mask 255.254.0.0

Wildcard 0.1.255.255

Full /15 reference →

Related Ranges

Parent /14 block 100.48.0.0/14 Sibling /15 block 100.50.0.0/15

Adjacent Prefix Sizes

/13 524,286 hosts /14 262,142 hosts /15 131,070 hosts /16 65,534 hosts /17 32,766 hosts