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)10.2.17.64/26

network10.2.17.64/26

broadcast10.2.17.127

first host10.2.17.65

last host10.2.17.126

subnet mask255.255.255.192

wildcard0.0.0.63

addresses64

usable hosts62

classA

ipcalc 10.2.17.64/26

address00001010.00000010.00010001.01000000

subnet mask11111111.11111111.11111111.11000000

network00001010.00000010.00010001.01000000

broadcast00001010.00000010.00010001.01111111

green = network part, grey = host part

hex0x0a021140

decimal167907648

reverse dns64.17.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:1140

/26 split into /32 · 64 subnets

close ×

#	network	host range	broadcast
1	10.2.17.64/32	10.2.17.64 – 10.2.17.64	10.2.17.64
2	10.2.17.65/32	10.2.17.65 – 10.2.17.65	10.2.17.65
3	10.2.17.66/32	10.2.17.66 – 10.2.17.66	10.2.17.66
4	10.2.17.67/32	10.2.17.67 – 10.2.17.67	10.2.17.67
5	10.2.17.68/32	10.2.17.68 – 10.2.17.68	10.2.17.68
6	10.2.17.69/32	10.2.17.69 – 10.2.17.69	10.2.17.69
7	10.2.17.70/32	10.2.17.70 – 10.2.17.70	10.2.17.70
8	10.2.17.71/32	10.2.17.71 – 10.2.17.71	10.2.17.71
9	10.2.17.72/32	10.2.17.72 – 10.2.17.72	10.2.17.72
10	10.2.17.73/32	10.2.17.73 – 10.2.17.73	10.2.17.73
11	10.2.17.74/32	10.2.17.74 – 10.2.17.74	10.2.17.74
12	10.2.17.75/32	10.2.17.75 – 10.2.17.75	10.2.17.75
13	10.2.17.76/32	10.2.17.76 – 10.2.17.76	10.2.17.76
14	10.2.17.77/32	10.2.17.77 – 10.2.17.77	10.2.17.77
15	10.2.17.78/32	10.2.17.78 – 10.2.17.78	10.2.17.78
16	10.2.17.79/32	10.2.17.79 – 10.2.17.79	10.2.17.79
17	10.2.17.80/32	10.2.17.80 – 10.2.17.80	10.2.17.80
18	10.2.17.81/32	10.2.17.81 – 10.2.17.81	10.2.17.81
19	10.2.17.82/32	10.2.17.82 – 10.2.17.82	10.2.17.82
20	10.2.17.83/32	10.2.17.83 – 10.2.17.83	10.2.17.83
21	10.2.17.84/32	10.2.17.84 – 10.2.17.84	10.2.17.84
22	10.2.17.85/32	10.2.17.85 – 10.2.17.85	10.2.17.85
23	10.2.17.86/32	10.2.17.86 – 10.2.17.86	10.2.17.86
24	10.2.17.87/32	10.2.17.87 – 10.2.17.87	10.2.17.87
25	10.2.17.88/32	10.2.17.88 – 10.2.17.88	10.2.17.88
26	10.2.17.89/32	10.2.17.89 – 10.2.17.89	10.2.17.89
27	10.2.17.90/32	10.2.17.90 – 10.2.17.90	10.2.17.90
28	10.2.17.91/32	10.2.17.91 – 10.2.17.91	10.2.17.91
29	10.2.17.92/32	10.2.17.92 – 10.2.17.92	10.2.17.92
30	10.2.17.93/32	10.2.17.93 – 10.2.17.93	10.2.17.93
31	10.2.17.94/32	10.2.17.94 – 10.2.17.94	10.2.17.94
32	10.2.17.95/32	10.2.17.95 – 10.2.17.95	10.2.17.95
33	10.2.17.96/32	10.2.17.96 – 10.2.17.96	10.2.17.96
34	10.2.17.97/32	10.2.17.97 – 10.2.17.97	10.2.17.97
35	10.2.17.98/32	10.2.17.98 – 10.2.17.98	10.2.17.98
36	10.2.17.99/32	10.2.17.99 – 10.2.17.99	10.2.17.99
37	10.2.17.100/32	10.2.17.100 – 10.2.17.100	10.2.17.100
38	10.2.17.101/32	10.2.17.101 – 10.2.17.101	10.2.17.101
39	10.2.17.102/32	10.2.17.102 – 10.2.17.102	10.2.17.102
40	10.2.17.103/32	10.2.17.103 – 10.2.17.103	10.2.17.103
41	10.2.17.104/32	10.2.17.104 – 10.2.17.104	10.2.17.104
42	10.2.17.105/32	10.2.17.105 – 10.2.17.105	10.2.17.105
43	10.2.17.106/32	10.2.17.106 – 10.2.17.106	10.2.17.106
44	10.2.17.107/32	10.2.17.107 – 10.2.17.107	10.2.17.107
45	10.2.17.108/32	10.2.17.108 – 10.2.17.108	10.2.17.108
46	10.2.17.109/32	10.2.17.109 – 10.2.17.109	10.2.17.109
47	10.2.17.110/32	10.2.17.110 – 10.2.17.110	10.2.17.110
48	10.2.17.111/32	10.2.17.111 – 10.2.17.111	10.2.17.111
49	10.2.17.112/32	10.2.17.112 – 10.2.17.112	10.2.17.112
50	10.2.17.113/32	10.2.17.113 – 10.2.17.113	10.2.17.113
51	10.2.17.114/32	10.2.17.114 – 10.2.17.114	10.2.17.114
52	10.2.17.115/32	10.2.17.115 – 10.2.17.115	10.2.17.115
53	10.2.17.116/32	10.2.17.116 – 10.2.17.116	10.2.17.116
54	10.2.17.117/32	10.2.17.117 – 10.2.17.117	10.2.17.117
55	10.2.17.118/32	10.2.17.118 – 10.2.17.118	10.2.17.118
56	10.2.17.119/32	10.2.17.119 – 10.2.17.119	10.2.17.119
57	10.2.17.120/32	10.2.17.120 – 10.2.17.120	10.2.17.120
58	10.2.17.121/32	10.2.17.121 – 10.2.17.121	10.2.17.121
59	10.2.17.122/32	10.2.17.122 – 10.2.17.122	10.2.17.122
60	10.2.17.123/32	10.2.17.123 – 10.2.17.123	10.2.17.123
61	10.2.17.124/32	10.2.17.124 – 10.2.17.124	10.2.17.124
62	10.2.17.125/32	10.2.17.125 – 10.2.17.125	10.2.17.125
63	10.2.17.126/32	10.2.17.126 – 10.2.17.126	10.2.17.126
64	10.2.17.127/32	10.2.17.127 – 10.2.17.127	10.2.17.127

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 →