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)172.16.12.64/26

network172.16.12.64/26

broadcast172.16.12.127

first host172.16.12.65

last host172.16.12.126

subnet mask255.255.255.192

wildcard0.0.0.63

addresses64

usable hosts62

classB

ipcalc 172.16.12.64/26

address10101100.00010000.00001100.01000000

subnet mask11111111.11111111.11111111.11000000

network10101100.00010000.00001100.01000000

broadcast10101100.00010000.00001100.01111111

green = network part, grey = host part

hex0xac100c40

decimal2886732864

reverse dns64.12.16.172.in-addr.arpa

ipv4-mapped::ffff:ac10:c40

/26 split into /32 · 64 subnets

close ×

#	network	host range	broadcast
1	172.16.12.64/32	172.16.12.64 – 172.16.12.64	172.16.12.64
2	172.16.12.65/32	172.16.12.65 – 172.16.12.65	172.16.12.65
3	172.16.12.66/32	172.16.12.66 – 172.16.12.66	172.16.12.66
4	172.16.12.67/32	172.16.12.67 – 172.16.12.67	172.16.12.67
5	172.16.12.68/32	172.16.12.68 – 172.16.12.68	172.16.12.68
6	172.16.12.69/32	172.16.12.69 – 172.16.12.69	172.16.12.69
7	172.16.12.70/32	172.16.12.70 – 172.16.12.70	172.16.12.70
8	172.16.12.71/32	172.16.12.71 – 172.16.12.71	172.16.12.71
9	172.16.12.72/32	172.16.12.72 – 172.16.12.72	172.16.12.72
10	172.16.12.73/32	172.16.12.73 – 172.16.12.73	172.16.12.73
11	172.16.12.74/32	172.16.12.74 – 172.16.12.74	172.16.12.74
12	172.16.12.75/32	172.16.12.75 – 172.16.12.75	172.16.12.75
13	172.16.12.76/32	172.16.12.76 – 172.16.12.76	172.16.12.76
14	172.16.12.77/32	172.16.12.77 – 172.16.12.77	172.16.12.77
15	172.16.12.78/32	172.16.12.78 – 172.16.12.78	172.16.12.78
16	172.16.12.79/32	172.16.12.79 – 172.16.12.79	172.16.12.79
17	172.16.12.80/32	172.16.12.80 – 172.16.12.80	172.16.12.80
18	172.16.12.81/32	172.16.12.81 – 172.16.12.81	172.16.12.81
19	172.16.12.82/32	172.16.12.82 – 172.16.12.82	172.16.12.82
20	172.16.12.83/32	172.16.12.83 – 172.16.12.83	172.16.12.83
21	172.16.12.84/32	172.16.12.84 – 172.16.12.84	172.16.12.84
22	172.16.12.85/32	172.16.12.85 – 172.16.12.85	172.16.12.85
23	172.16.12.86/32	172.16.12.86 – 172.16.12.86	172.16.12.86
24	172.16.12.87/32	172.16.12.87 – 172.16.12.87	172.16.12.87
25	172.16.12.88/32	172.16.12.88 – 172.16.12.88	172.16.12.88
26	172.16.12.89/32	172.16.12.89 – 172.16.12.89	172.16.12.89
27	172.16.12.90/32	172.16.12.90 – 172.16.12.90	172.16.12.90
28	172.16.12.91/32	172.16.12.91 – 172.16.12.91	172.16.12.91
29	172.16.12.92/32	172.16.12.92 – 172.16.12.92	172.16.12.92
30	172.16.12.93/32	172.16.12.93 – 172.16.12.93	172.16.12.93
31	172.16.12.94/32	172.16.12.94 – 172.16.12.94	172.16.12.94
32	172.16.12.95/32	172.16.12.95 – 172.16.12.95	172.16.12.95
33	172.16.12.96/32	172.16.12.96 – 172.16.12.96	172.16.12.96
34	172.16.12.97/32	172.16.12.97 – 172.16.12.97	172.16.12.97
35	172.16.12.98/32	172.16.12.98 – 172.16.12.98	172.16.12.98
36	172.16.12.99/32	172.16.12.99 – 172.16.12.99	172.16.12.99
37	172.16.12.100/32	172.16.12.100 – 172.16.12.100	172.16.12.100
38	172.16.12.101/32	172.16.12.101 – 172.16.12.101	172.16.12.101
39	172.16.12.102/32	172.16.12.102 – 172.16.12.102	172.16.12.102
40	172.16.12.103/32	172.16.12.103 – 172.16.12.103	172.16.12.103
41	172.16.12.104/32	172.16.12.104 – 172.16.12.104	172.16.12.104
42	172.16.12.105/32	172.16.12.105 – 172.16.12.105	172.16.12.105
43	172.16.12.106/32	172.16.12.106 – 172.16.12.106	172.16.12.106
44	172.16.12.107/32	172.16.12.107 – 172.16.12.107	172.16.12.107
45	172.16.12.108/32	172.16.12.108 – 172.16.12.108	172.16.12.108
46	172.16.12.109/32	172.16.12.109 – 172.16.12.109	172.16.12.109
47	172.16.12.110/32	172.16.12.110 – 172.16.12.110	172.16.12.110
48	172.16.12.111/32	172.16.12.111 – 172.16.12.111	172.16.12.111
49	172.16.12.112/32	172.16.12.112 – 172.16.12.112	172.16.12.112
50	172.16.12.113/32	172.16.12.113 – 172.16.12.113	172.16.12.113
51	172.16.12.114/32	172.16.12.114 – 172.16.12.114	172.16.12.114
52	172.16.12.115/32	172.16.12.115 – 172.16.12.115	172.16.12.115
53	172.16.12.116/32	172.16.12.116 – 172.16.12.116	172.16.12.116
54	172.16.12.117/32	172.16.12.117 – 172.16.12.117	172.16.12.117
55	172.16.12.118/32	172.16.12.118 – 172.16.12.118	172.16.12.118
56	172.16.12.119/32	172.16.12.119 – 172.16.12.119	172.16.12.119
57	172.16.12.120/32	172.16.12.120 – 172.16.12.120	172.16.12.120
58	172.16.12.121/32	172.16.12.121 – 172.16.12.121	172.16.12.121
59	172.16.12.122/32	172.16.12.122 – 172.16.12.122	172.16.12.122
60	172.16.12.123/32	172.16.12.123 – 172.16.12.123	172.16.12.123
61	172.16.12.124/32	172.16.12.124 – 172.16.12.124	172.16.12.124
62	172.16.12.125/32	172.16.12.125 – 172.16.12.125	172.16.12.125
63	172.16.12.126/32	172.16.12.126 – 172.16.12.126	172.16.12.126
64	172.16.12.127/32	172.16.12.127 – 172.16.12.127	172.16.12.127

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 →