IPv4 Subnet Calculator

Enter an IP with a CIDR prefix or a subnet mask to see its network, broadcast, host range, and host count. You can also split the network into smaller subnets.

Try:192.168.1.10/24 10.0.0.0/8 172.16.5.4/20 203.0.113.9/29

IPv6 calculator →

private IP (RFC 1918)10.76.20.64/26

network10.76.20.64/26

broadcast10.76.20.127

first host10.76.20.65

last host10.76.20.126

subnet mask255.255.255.192

wildcard0.0.0.63

addresses64

usable hosts62

classA

ipcalc 10.76.20.64/26

address00001010.01001100.00010100.01000000

subnet mask11111111.11111111.11111111.11000000

network00001010.01001100.00010100.01000000

broadcast00001010.01001100.00010100.01111111

green = network part, grey = host part

hex0x0a4c1440

decimal172758080

reverse dns64.20.76.10.in-addr.arpa

ipv4-mapped::ffff:a4c:1440

/26 split into /32 · 64 subnets

close ×

#	network	host range	broadcast
1	10.76.20.64/32	10.76.20.64 – 10.76.20.64	10.76.20.64
2	10.76.20.65/32	10.76.20.65 – 10.76.20.65	10.76.20.65
3	10.76.20.66/32	10.76.20.66 – 10.76.20.66	10.76.20.66
4	10.76.20.67/32	10.76.20.67 – 10.76.20.67	10.76.20.67
5	10.76.20.68/32	10.76.20.68 – 10.76.20.68	10.76.20.68
6	10.76.20.69/32	10.76.20.69 – 10.76.20.69	10.76.20.69
7	10.76.20.70/32	10.76.20.70 – 10.76.20.70	10.76.20.70
8	10.76.20.71/32	10.76.20.71 – 10.76.20.71	10.76.20.71
9	10.76.20.72/32	10.76.20.72 – 10.76.20.72	10.76.20.72
10	10.76.20.73/32	10.76.20.73 – 10.76.20.73	10.76.20.73
11	10.76.20.74/32	10.76.20.74 – 10.76.20.74	10.76.20.74
12	10.76.20.75/32	10.76.20.75 – 10.76.20.75	10.76.20.75
13	10.76.20.76/32	10.76.20.76 – 10.76.20.76	10.76.20.76
14	10.76.20.77/32	10.76.20.77 – 10.76.20.77	10.76.20.77
15	10.76.20.78/32	10.76.20.78 – 10.76.20.78	10.76.20.78
16	10.76.20.79/32	10.76.20.79 – 10.76.20.79	10.76.20.79
17	10.76.20.80/32	10.76.20.80 – 10.76.20.80	10.76.20.80
18	10.76.20.81/32	10.76.20.81 – 10.76.20.81	10.76.20.81
19	10.76.20.82/32	10.76.20.82 – 10.76.20.82	10.76.20.82
20	10.76.20.83/32	10.76.20.83 – 10.76.20.83	10.76.20.83
21	10.76.20.84/32	10.76.20.84 – 10.76.20.84	10.76.20.84
22	10.76.20.85/32	10.76.20.85 – 10.76.20.85	10.76.20.85
23	10.76.20.86/32	10.76.20.86 – 10.76.20.86	10.76.20.86
24	10.76.20.87/32	10.76.20.87 – 10.76.20.87	10.76.20.87
25	10.76.20.88/32	10.76.20.88 – 10.76.20.88	10.76.20.88
26	10.76.20.89/32	10.76.20.89 – 10.76.20.89	10.76.20.89
27	10.76.20.90/32	10.76.20.90 – 10.76.20.90	10.76.20.90
28	10.76.20.91/32	10.76.20.91 – 10.76.20.91	10.76.20.91
29	10.76.20.92/32	10.76.20.92 – 10.76.20.92	10.76.20.92
30	10.76.20.93/32	10.76.20.93 – 10.76.20.93	10.76.20.93
31	10.76.20.94/32	10.76.20.94 – 10.76.20.94	10.76.20.94
32	10.76.20.95/32	10.76.20.95 – 10.76.20.95	10.76.20.95
33	10.76.20.96/32	10.76.20.96 – 10.76.20.96	10.76.20.96
34	10.76.20.97/32	10.76.20.97 – 10.76.20.97	10.76.20.97
35	10.76.20.98/32	10.76.20.98 – 10.76.20.98	10.76.20.98
36	10.76.20.99/32	10.76.20.99 – 10.76.20.99	10.76.20.99
37	10.76.20.100/32	10.76.20.100 – 10.76.20.100	10.76.20.100
38	10.76.20.101/32	10.76.20.101 – 10.76.20.101	10.76.20.101
39	10.76.20.102/32	10.76.20.102 – 10.76.20.102	10.76.20.102
40	10.76.20.103/32	10.76.20.103 – 10.76.20.103	10.76.20.103
41	10.76.20.104/32	10.76.20.104 – 10.76.20.104	10.76.20.104
42	10.76.20.105/32	10.76.20.105 – 10.76.20.105	10.76.20.105
43	10.76.20.106/32	10.76.20.106 – 10.76.20.106	10.76.20.106
44	10.76.20.107/32	10.76.20.107 – 10.76.20.107	10.76.20.107
45	10.76.20.108/32	10.76.20.108 – 10.76.20.108	10.76.20.108
46	10.76.20.109/32	10.76.20.109 – 10.76.20.109	10.76.20.109
47	10.76.20.110/32	10.76.20.110 – 10.76.20.110	10.76.20.110
48	10.76.20.111/32	10.76.20.111 – 10.76.20.111	10.76.20.111
49	10.76.20.112/32	10.76.20.112 – 10.76.20.112	10.76.20.112
50	10.76.20.113/32	10.76.20.113 – 10.76.20.113	10.76.20.113
51	10.76.20.114/32	10.76.20.114 – 10.76.20.114	10.76.20.114
52	10.76.20.115/32	10.76.20.115 – 10.76.20.115	10.76.20.115
53	10.76.20.116/32	10.76.20.116 – 10.76.20.116	10.76.20.116
54	10.76.20.117/32	10.76.20.117 – 10.76.20.117	10.76.20.117
55	10.76.20.118/32	10.76.20.118 – 10.76.20.118	10.76.20.118
56	10.76.20.119/32	10.76.20.119 – 10.76.20.119	10.76.20.119
57	10.76.20.120/32	10.76.20.120 – 10.76.20.120	10.76.20.120
58	10.76.20.121/32	10.76.20.121 – 10.76.20.121	10.76.20.121
59	10.76.20.122/32	10.76.20.122 – 10.76.20.122	10.76.20.122
60	10.76.20.123/32	10.76.20.123 – 10.76.20.123	10.76.20.123
61	10.76.20.124/32	10.76.20.124 – 10.76.20.124	10.76.20.124
62	10.76.20.125/32	10.76.20.125 – 10.76.20.125	10.76.20.125
63	10.76.20.126/32	10.76.20.126 – 10.76.20.126	10.76.20.126
64	10.76.20.127/32	10.76.20.127 – 10.76.20.127	10.76.20.127

01 / table

IPv4 CIDR prefix table.

Click a prefix longer than your network to split it into subnets.

prefix	subnet mask	addresses	hosts	in your /26
/0	0.0.0.0	4,294,967,296	4,294,967,294	-
/1	128.0.0.0	2,147,483,648	2,147,483,646	-
/2	192.0.0.0	1,073,741,824	1,073,741,822	-
/3	224.0.0.0	536,870,912	536,870,910	-
/4	240.0.0.0	268,435,456	268,435,454	-
/5	248.0.0.0	134,217,728	134,217,726	-
/6	252.0.0.0	67,108,864	67,108,862	-
/7	254.0.0.0	33,554,432	33,554,430	-
/8	255.0.0.0	16,777,216	16,777,214	-
/9	255.128.0.0	8,388,608	8,388,606	-
/10	255.192.0.0	4,194,304	4,194,302	-
/11	255.224.0.0	2,097,152	2,097,150	-
/12	255.240.0.0	1,048,576	1,048,574	-
/13	255.248.0.0	524,288	524,286	-
/14	255.252.0.0	262,144	262,142	-
/15	255.254.0.0	131,072	131,070	-
/16	255.255.0.0	65,536	65,534	-
/17	255.255.128.0	32,768	32,766	-
/18	255.255.192.0	16,384	16,382	-
/19	255.255.224.0	8,192	8,190	-
/20	255.255.240.0	4,096	4,094	-
/21	255.255.248.0	2,048	2,046	-
/22	255.255.252.0	1,024	1,022	-
/23	255.255.254.0	512	510	-
/24	255.255.255.0	256	254	-
/25	255.255.255.128	128	126	-
/26	255.255.255.192	64	62	1
/27	255.255.255.224	32	30	2 split →
/28	255.255.255.240	16	14	4 split →
/29	255.255.255.248	8	6	8 split →
/30	255.255.255.252	4	2	16 split →
/31	255.255.255.254	2	2	32 split →
/32	255.255.255.255	1	1	64 split →

02 / faq

About this calculator.

How do I use this subnet calculator?

▼

Type an IP address followed by a prefix, like 192.168.1.10/24, or by a subnet mask, like 192.168.1.10 255.255.255.0. Without a prefix it uses /24. Click a row in the table to split the network into smaller subnets.

Why are usable hosts always 2 fewer?

▼

The first address in a subnet is the network address and the last is the broadcast address, so neither can go to a device. The exceptions are /31 (point-to-point links, RFC 3021) and /32 (a single address), which use every address.

Can I use it from a terminal?

▼

Yes. curl 'ipku.in/en/tools/ipv4-subnet-calculator?q=192.168.1.10/24' returns the result as plain text.

Learn how to work it out →