11.151.91.64/28

Public

Class A — /28 prefix — 14 usable hosts

Network Address

11.151.91.64

Broadcast Address

11.151.91.79

Subnet Mask

255.255.255.240

Usable Hosts

First Usable IP

11.151.91.65

Last Usable IP

11.151.91.78

Total IPs

Prefix Length

/28

Network address — the base address of the block (11.151.91.64). All devices in this subnet share this prefix. Cannot be assigned to a host.

Broadcast address — packets sent to 11.151.91.79 are delivered to every device in the subnet. Also reserved — not assignable.

Usable hosts — the 14 addresses between those two that you can assign to servers, VMs, or interfaces.

Subnet mask — 255.255.255.240 is the dotted-decimal equivalent of /28. Older tools and Cisco configs use this format instead of CIDR slash notation.

Full Details

CIDR Notation	11.151.91.64/28
Network Address	11.151.91.64
Broadcast Address	11.151.91.79
Subnet Mask	255.255.255.240
Wildcard Mask	0.0.0.15
Prefix Length	/28
IP Address Class	Class A
Total IP Addresses	16
Usable Host Addresses	14
First Usable IP	11.151.91.65
Last Usable IP	11.151.91.78
Network (Hex)	0x0B975B40
Broadcast (Hex)	0x0B975B4F
Address Type	Public / Globally Routable

Binary Representation

Network Address

00001011.10010111.01011011 00001011.10010111.01011011.01000000

Subnet Mask

11111111.11111111.11111111.11110000

The first 28 bits (1s in the mask) identify the network. The remaining 4 bits identify hosts within the network.

Split into Equal Subnets

Split 11.151.91.64/28 into 2 equal /29 subnets (6 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	11.151.91.64/29	11.151.91.64	11.151.91.65	11.151.91.70	11.151.91.71	6
2	11.151.91.72/29	11.151.91.72	11.151.91.73	11.151.91.78	11.151.91.79	6

Split 11.151.91.64/28 into 4 equal /30 subnets (2 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	11.151.91.64/30	11.151.91.64	11.151.91.65	11.151.91.66	11.151.91.67	2
2	11.151.91.68/30	11.151.91.68	11.151.91.69	11.151.91.70	11.151.91.71	2
3	11.151.91.72/30	11.151.91.72	11.151.91.73	11.151.91.74	11.151.91.75	2
4	11.151.91.76/30	11.151.91.76	11.151.91.77	11.151.91.78	11.151.91.79	2

All 16 IP Addresses in this Range

11.151.91.64 net

11.151.91.65

11.151.91.66

11.151.91.67

11.151.91.68

11.151.91.69

11.151.91.70

11.151.91.71

11.151.91.72

11.151.91.73

11.151.91.74

11.151.91.75

11.151.91.76

11.151.91.77

11.151.91.78

11.151.91.79 bcast

/28 Subnet Reference

Total IPs 16

Usable Hosts 14

Subnet Mask 255.255.255.240

Wildcard 0.0.0.15

Full /28 reference →

Related Ranges

Parent /27 block 11.151.91.64/27 Sibling /28 block 11.151.91.80/28

Adjacent Prefix Sizes

/26 62 hosts /27 30 hosts /28 14 hosts /29 6 hosts /30 2 hosts