11.33.61.128/28

Public

Class A — /28 prefix — 14 usable hosts

Network Address

11.33.61.128

Broadcast Address

11.33.61.143

Subnet Mask

255.255.255.240

Usable Hosts

First Usable IP

11.33.61.129

Last Usable IP

11.33.61.142

Total IPs

Prefix Length

/28

Network address — the base address of the block (11.33.61.128). All devices in this subnet share this prefix. Cannot be assigned to a host.

Broadcast address — packets sent to 11.33.61.143 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	11.33.61.128/28
Network Address	11.33.61.128
Broadcast Address	11.33.61.143
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	11.33.61.129
Last Usable IP	11.33.61.142
Network (Hex)	0x0B213D80
Broadcast (Hex)	0x0B213D8F
Address Type	Public / Globally Routable

Binary Representation

Network Address

00001011.00100001.00111101 00001011.00100001.00111101.10000000

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 11.33.61.128/28 into 2 equal /29 subnets (6 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	11.33.61.128/29	11.33.61.128	11.33.61.129	11.33.61.134	11.33.61.135	6
2	11.33.61.136/29	11.33.61.136	11.33.61.137	11.33.61.142	11.33.61.143	6

Split 11.33.61.128/28 into 4 equal /30 subnets (2 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	11.33.61.128/30	11.33.61.128	11.33.61.129	11.33.61.130	11.33.61.131	2
2	11.33.61.132/30	11.33.61.132	11.33.61.133	11.33.61.134	11.33.61.135	2
3	11.33.61.136/30	11.33.61.136	11.33.61.137	11.33.61.138	11.33.61.139	2
4	11.33.61.140/30	11.33.61.140	11.33.61.141	11.33.61.142	11.33.61.143	2

All 16 IP Addresses in this Range

11.33.61.128 net

11.33.61.129

11.33.61.130

11.33.61.131

11.33.61.132

11.33.61.133

11.33.61.134

11.33.61.135

11.33.61.136

11.33.61.137

11.33.61.138

11.33.61.139

11.33.61.140

11.33.61.141

11.33.61.142

11.33.61.143 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 11.33.61.128/27 Sibling /28 block 11.33.61.144/28

Adjacent Prefix Sizes

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