121.5.42.0/26

Public

Class A — /26 prefix — 62 usable hosts

Network Address

121.5.42.0

Broadcast Address

121.5.42.63

Subnet Mask

255.255.255.192

Usable Hosts

First Usable IP

121.5.42.1

Last Usable IP

121.5.42.62

Total IPs

Prefix Length

/26

Network address — the base address of the block (121.5.42.0). All devices in this subnet share this prefix. Cannot be assigned to a host.

Broadcast address — packets sent to 121.5.42.63 are delivered to every device in the subnet. Also reserved — not assignable.

Usable hosts — the 62 addresses between those two that you can assign to servers, VMs, or interfaces.

Subnet mask — 255.255.255.192 is the dotted-decimal equivalent of /26. Older tools and Cisco configs use this format instead of CIDR slash notation.

Full Details

CIDR Notation	121.5.42.0/26
Network Address	121.5.42.0
Broadcast Address	121.5.42.63
Subnet Mask	255.255.255.192
Wildcard Mask	0.0.0.63
Prefix Length	/26
IP Address Class	Class A
Total IP Addresses	64
Usable Host Addresses	62
First Usable IP	121.5.42.1
Last Usable IP	121.5.42.62
Network (Hex)	0x79052A00
Broadcast (Hex)	0x79052A3F
Address Type	Public / Globally Routable

Binary Representation

Network Address

01111001.00000101.00101010 01111001.00000101.00101010.00000000

Subnet Mask

11111111.11111111.11111111.11000000

The first 26 bits (1s in the mask) identify the network. The remaining 6 bits identify hosts within the network.

Split into Equal Subnets

Split 121.5.42.0/26 into 2 equal /27 subnets (30 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	121.5.42.0/27	121.5.42.0	121.5.42.1	121.5.42.30	121.5.42.31	30
2	121.5.42.32/27	121.5.42.32	121.5.42.33	121.5.42.62	121.5.42.63	30

Split 121.5.42.0/26 into 4 equal /28 subnets (14 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	121.5.42.0/28	121.5.42.0	121.5.42.1	121.5.42.14	121.5.42.15	14
2	121.5.42.16/28	121.5.42.16	121.5.42.17	121.5.42.30	121.5.42.31	14
3	121.5.42.32/28	121.5.42.32	121.5.42.33	121.5.42.46	121.5.42.47	14
4	121.5.42.48/28	121.5.42.48	121.5.42.49	121.5.42.62	121.5.42.63	14

Split 121.5.42.0/26 into 8 equal /29 subnets (6 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	121.5.42.0/29	121.5.42.0	121.5.42.1	121.5.42.6	121.5.42.7	6
2	121.5.42.8/29	121.5.42.8	121.5.42.9	121.5.42.14	121.5.42.15	6
3	121.5.42.16/29	121.5.42.16	121.5.42.17	121.5.42.22	121.5.42.23	6
4	121.5.42.24/29	121.5.42.24	121.5.42.25	121.5.42.30	121.5.42.31	6
5	121.5.42.32/29	121.5.42.32	121.5.42.33	121.5.42.38	121.5.42.39	6
6	121.5.42.40/29	121.5.42.40	121.5.42.41	121.5.42.46	121.5.42.47	6
7	121.5.42.48/29	121.5.42.48	121.5.42.49	121.5.42.54	121.5.42.55	6
8	121.5.42.56/29	121.5.42.56	121.5.42.57	121.5.42.62	121.5.42.63	6

Split 121.5.42.0/26 into 16 equal /30 subnets (2 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	121.5.42.0/30	121.5.42.0	121.5.42.1	121.5.42.2	121.5.42.3	2
2	121.5.42.4/30	121.5.42.4	121.5.42.5	121.5.42.6	121.5.42.7	2
3	121.5.42.8/30	121.5.42.8	121.5.42.9	121.5.42.10	121.5.42.11	2
4	121.5.42.12/30	121.5.42.12	121.5.42.13	121.5.42.14	121.5.42.15	2
5	121.5.42.16/30	121.5.42.16	121.5.42.17	121.5.42.18	121.5.42.19	2
6	121.5.42.20/30	121.5.42.20	121.5.42.21	121.5.42.22	121.5.42.23	2
7	121.5.42.24/30	121.5.42.24	121.5.42.25	121.5.42.26	121.5.42.27	2
8	121.5.42.28/30	121.5.42.28	121.5.42.29	121.5.42.30	121.5.42.31	2
9	121.5.42.32/30	121.5.42.32	121.5.42.33	121.5.42.34	121.5.42.35	2
10	121.5.42.36/30	121.5.42.36	121.5.42.37	121.5.42.38	121.5.42.39	2
11	121.5.42.40/30	121.5.42.40	121.5.42.41	121.5.42.42	121.5.42.43	2
12	121.5.42.44/30	121.5.42.44	121.5.42.45	121.5.42.46	121.5.42.47	2
13	121.5.42.48/30	121.5.42.48	121.5.42.49	121.5.42.50	121.5.42.51	2
14	121.5.42.52/30	121.5.42.52	121.5.42.53	121.5.42.54	121.5.42.55	2
15	121.5.42.56/30	121.5.42.56	121.5.42.57	121.5.42.58	121.5.42.59	2
16	121.5.42.60/30	121.5.42.60	121.5.42.61	121.5.42.62	121.5.42.63	2

IP Address Sample

Showing first 16 of 64 total IPs.

121.5.42.0 net

121.5.42.1

121.5.42.2

121.5.42.3

121.5.42.4

121.5.42.5

121.5.42.6

121.5.42.7

121.5.42.8

121.5.42.9

121.5.42.10

121.5.42.11

121.5.42.12

121.5.42.13

121.5.42.14

121.5.42.15

… 48 more IPs …

/26 Subnet Reference

Total IPs 64

Usable Hosts 62

Subnet Mask 255.255.255.192

Wildcard 0.0.0.63

Full /26 reference →

Related Ranges

Parent /25 block 121.5.42.0/25 Sibling /26 block 121.5.42.64/26

Adjacent Prefix Sizes

/24 254 hosts /25 126 hosts /26 62 hosts /27 30 hosts /28 14 hosts