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)172.16.0.64/26

network172.16.0.64/26

broadcast172.16.0.127

first host172.16.0.65

last host172.16.0.126

subnet mask255.255.255.192

wildcard0.0.0.63

addresses64

usable hosts62

classB

ipcalc 172.16.0.64/26

address10101100.00010000.00000000.01000000

subnet mask11111111.11111111.11111111.11000000

network10101100.00010000.00000000.01000000

broadcast10101100.00010000.00000000.01111111

green = network part, grey = host part

hex0xac100040

decimal2886729792

reverse dns64.0.16.172.in-addr.arpa

ipv4-mapped::ffff:ac10:40

/26 split into /32 · 64 subnets

close ×

#	network	host range	broadcast
1	172.16.0.64/32	172.16.0.64 – 172.16.0.64	172.16.0.64
2	172.16.0.65/32	172.16.0.65 – 172.16.0.65	172.16.0.65
3	172.16.0.66/32	172.16.0.66 – 172.16.0.66	172.16.0.66
4	172.16.0.67/32	172.16.0.67 – 172.16.0.67	172.16.0.67
5	172.16.0.68/32	172.16.0.68 – 172.16.0.68	172.16.0.68
6	172.16.0.69/32	172.16.0.69 – 172.16.0.69	172.16.0.69
7	172.16.0.70/32	172.16.0.70 – 172.16.0.70	172.16.0.70
8	172.16.0.71/32	172.16.0.71 – 172.16.0.71	172.16.0.71
9	172.16.0.72/32	172.16.0.72 – 172.16.0.72	172.16.0.72
10	172.16.0.73/32	172.16.0.73 – 172.16.0.73	172.16.0.73
11	172.16.0.74/32	172.16.0.74 – 172.16.0.74	172.16.0.74
12	172.16.0.75/32	172.16.0.75 – 172.16.0.75	172.16.0.75
13	172.16.0.76/32	172.16.0.76 – 172.16.0.76	172.16.0.76
14	172.16.0.77/32	172.16.0.77 – 172.16.0.77	172.16.0.77
15	172.16.0.78/32	172.16.0.78 – 172.16.0.78	172.16.0.78
16	172.16.0.79/32	172.16.0.79 – 172.16.0.79	172.16.0.79
17	172.16.0.80/32	172.16.0.80 – 172.16.0.80	172.16.0.80
18	172.16.0.81/32	172.16.0.81 – 172.16.0.81	172.16.0.81
19	172.16.0.82/32	172.16.0.82 – 172.16.0.82	172.16.0.82
20	172.16.0.83/32	172.16.0.83 – 172.16.0.83	172.16.0.83
21	172.16.0.84/32	172.16.0.84 – 172.16.0.84	172.16.0.84
22	172.16.0.85/32	172.16.0.85 – 172.16.0.85	172.16.0.85
23	172.16.0.86/32	172.16.0.86 – 172.16.0.86	172.16.0.86
24	172.16.0.87/32	172.16.0.87 – 172.16.0.87	172.16.0.87
25	172.16.0.88/32	172.16.0.88 – 172.16.0.88	172.16.0.88
26	172.16.0.89/32	172.16.0.89 – 172.16.0.89	172.16.0.89
27	172.16.0.90/32	172.16.0.90 – 172.16.0.90	172.16.0.90
28	172.16.0.91/32	172.16.0.91 – 172.16.0.91	172.16.0.91
29	172.16.0.92/32	172.16.0.92 – 172.16.0.92	172.16.0.92
30	172.16.0.93/32	172.16.0.93 – 172.16.0.93	172.16.0.93
31	172.16.0.94/32	172.16.0.94 – 172.16.0.94	172.16.0.94
32	172.16.0.95/32	172.16.0.95 – 172.16.0.95	172.16.0.95
33	172.16.0.96/32	172.16.0.96 – 172.16.0.96	172.16.0.96
34	172.16.0.97/32	172.16.0.97 – 172.16.0.97	172.16.0.97
35	172.16.0.98/32	172.16.0.98 – 172.16.0.98	172.16.0.98
36	172.16.0.99/32	172.16.0.99 – 172.16.0.99	172.16.0.99
37	172.16.0.100/32	172.16.0.100 – 172.16.0.100	172.16.0.100
38	172.16.0.101/32	172.16.0.101 – 172.16.0.101	172.16.0.101
39	172.16.0.102/32	172.16.0.102 – 172.16.0.102	172.16.0.102
40	172.16.0.103/32	172.16.0.103 – 172.16.0.103	172.16.0.103
41	172.16.0.104/32	172.16.0.104 – 172.16.0.104	172.16.0.104
42	172.16.0.105/32	172.16.0.105 – 172.16.0.105	172.16.0.105
43	172.16.0.106/32	172.16.0.106 – 172.16.0.106	172.16.0.106
44	172.16.0.107/32	172.16.0.107 – 172.16.0.107	172.16.0.107
45	172.16.0.108/32	172.16.0.108 – 172.16.0.108	172.16.0.108
46	172.16.0.109/32	172.16.0.109 – 172.16.0.109	172.16.0.109
47	172.16.0.110/32	172.16.0.110 – 172.16.0.110	172.16.0.110
48	172.16.0.111/32	172.16.0.111 – 172.16.0.111	172.16.0.111
49	172.16.0.112/32	172.16.0.112 – 172.16.0.112	172.16.0.112
50	172.16.0.113/32	172.16.0.113 – 172.16.0.113	172.16.0.113
51	172.16.0.114/32	172.16.0.114 – 172.16.0.114	172.16.0.114
52	172.16.0.115/32	172.16.0.115 – 172.16.0.115	172.16.0.115
53	172.16.0.116/32	172.16.0.116 – 172.16.0.116	172.16.0.116
54	172.16.0.117/32	172.16.0.117 – 172.16.0.117	172.16.0.117
55	172.16.0.118/32	172.16.0.118 – 172.16.0.118	172.16.0.118
56	172.16.0.119/32	172.16.0.119 – 172.16.0.119	172.16.0.119
57	172.16.0.120/32	172.16.0.120 – 172.16.0.120	172.16.0.120
58	172.16.0.121/32	172.16.0.121 – 172.16.0.121	172.16.0.121
59	172.16.0.122/32	172.16.0.122 – 172.16.0.122	172.16.0.122
60	172.16.0.123/32	172.16.0.123 – 172.16.0.123	172.16.0.123
61	172.16.0.124/32	172.16.0.124 – 172.16.0.124	172.16.0.124
62	172.16.0.125/32	172.16.0.125 – 172.16.0.125	172.16.0.125
63	172.16.0.126/32	172.16.0.126 – 172.16.0.126	172.16.0.126
64	172.16.0.127/32	172.16.0.127 – 172.16.0.127	172.16.0.127

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 →