21.69.12.64/26

Public

Class A — /26 prefix — 62 usable hosts

Network Address

21.69.12.64

Broadcast Address

21.69.12.127

Subnet Mask

255.255.255.192

Usable Hosts

First Usable IP

21.69.12.65

Last Usable IP

21.69.12.126

Total IPs

Prefix Length

/26

Network address — the base address of the block (21.69.12.64). All devices in this subnet share this prefix. Cannot be assigned to a host.

Broadcast address — packets sent to 21.69.12.127 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	21.69.12.64/26
Network Address	21.69.12.64
Broadcast Address	21.69.12.127
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	21.69.12.65
Last Usable IP	21.69.12.126
Network (Hex)	0x15450C40
Broadcast (Hex)	0x15450C7F
Address Type	Public / Globally Routable

Binary Representation

Network Address

00010101.01000101.00001100 00010101.01000101.00001100.01000000

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 21.69.12.64/26 into 2 equal /27 subnets (30 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	21.69.12.64/27	21.69.12.64	21.69.12.65	21.69.12.94	21.69.12.95	30
2	21.69.12.96/27	21.69.12.96	21.69.12.97	21.69.12.126	21.69.12.127	30

Split 21.69.12.64/26 into 4 equal /28 subnets (14 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	21.69.12.64/28	21.69.12.64	21.69.12.65	21.69.12.78	21.69.12.79	14
2	21.69.12.80/28	21.69.12.80	21.69.12.81	21.69.12.94	21.69.12.95	14
3	21.69.12.96/28	21.69.12.96	21.69.12.97	21.69.12.110	21.69.12.111	14
4	21.69.12.112/28	21.69.12.112	21.69.12.113	21.69.12.126	21.69.12.127	14

Split 21.69.12.64/26 into 8 equal /29 subnets (6 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	21.69.12.64/29	21.69.12.64	21.69.12.65	21.69.12.70	21.69.12.71	6
2	21.69.12.72/29	21.69.12.72	21.69.12.73	21.69.12.78	21.69.12.79	6
3	21.69.12.80/29	21.69.12.80	21.69.12.81	21.69.12.86	21.69.12.87	6
4	21.69.12.88/29	21.69.12.88	21.69.12.89	21.69.12.94	21.69.12.95	6
5	21.69.12.96/29	21.69.12.96	21.69.12.97	21.69.12.102	21.69.12.103	6
6	21.69.12.104/29	21.69.12.104	21.69.12.105	21.69.12.110	21.69.12.111	6
7	21.69.12.112/29	21.69.12.112	21.69.12.113	21.69.12.118	21.69.12.119	6
8	21.69.12.120/29	21.69.12.120	21.69.12.121	21.69.12.126	21.69.12.127	6

Split 21.69.12.64/26 into 16 equal /30 subnets (2 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	21.69.12.64/30	21.69.12.64	21.69.12.65	21.69.12.66	21.69.12.67	2
2	21.69.12.68/30	21.69.12.68	21.69.12.69	21.69.12.70	21.69.12.71	2
3	21.69.12.72/30	21.69.12.72	21.69.12.73	21.69.12.74	21.69.12.75	2
4	21.69.12.76/30	21.69.12.76	21.69.12.77	21.69.12.78	21.69.12.79	2
5	21.69.12.80/30	21.69.12.80	21.69.12.81	21.69.12.82	21.69.12.83	2
6	21.69.12.84/30	21.69.12.84	21.69.12.85	21.69.12.86	21.69.12.87	2
7	21.69.12.88/30	21.69.12.88	21.69.12.89	21.69.12.90	21.69.12.91	2
8	21.69.12.92/30	21.69.12.92	21.69.12.93	21.69.12.94	21.69.12.95	2
9	21.69.12.96/30	21.69.12.96	21.69.12.97	21.69.12.98	21.69.12.99	2
10	21.69.12.100/30	21.69.12.100	21.69.12.101	21.69.12.102	21.69.12.103	2
11	21.69.12.104/30	21.69.12.104	21.69.12.105	21.69.12.106	21.69.12.107	2
12	21.69.12.108/30	21.69.12.108	21.69.12.109	21.69.12.110	21.69.12.111	2
13	21.69.12.112/30	21.69.12.112	21.69.12.113	21.69.12.114	21.69.12.115	2
14	21.69.12.116/30	21.69.12.116	21.69.12.117	21.69.12.118	21.69.12.119	2
15	21.69.12.120/30	21.69.12.120	21.69.12.121	21.69.12.122	21.69.12.123	2
16	21.69.12.124/30	21.69.12.124	21.69.12.125	21.69.12.126	21.69.12.127	2

IP Address Sample

Showing first 16 of 64 total IPs.

21.69.12.64 net

21.69.12.65

21.69.12.66

21.69.12.67

21.69.12.68

21.69.12.69

21.69.12.70

21.69.12.71

21.69.12.72

21.69.12.73

21.69.12.74

21.69.12.75

21.69.12.76

21.69.12.77

21.69.12.78

21.69.12.79

… 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 21.69.12.0/25 Sibling /26 block 21.69.12.0/26

Adjacent Prefix Sizes

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