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)10.26.78.0/25

network10.26.78.0/25

broadcast10.26.78.127

first host10.26.78.1

last host10.26.78.126

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.26.78.0/25

address00001010.00011010.01001110.00000000

subnet mask11111111.11111111.11111111.10000000

network00001010.00011010.01001110.00000000

broadcast00001010.00011010.01001110.01111111

green = network part, grey = host part

hex0x0a1a4e00

decimal169496064

reverse dns0.78.26.10.in-addr.arpa

ipv4-mapped::ffff:a1a:4e00

/25 split into /31 · 64 subnets

close ×

#	network	host range	broadcast
1	10.26.78.0/31	10.26.78.0 – 10.26.78.1	10.26.78.1
2	10.26.78.2/31	10.26.78.2 – 10.26.78.3	10.26.78.3
3	10.26.78.4/31	10.26.78.4 – 10.26.78.5	10.26.78.5
4	10.26.78.6/31	10.26.78.6 – 10.26.78.7	10.26.78.7
5	10.26.78.8/31	10.26.78.8 – 10.26.78.9	10.26.78.9
6	10.26.78.10/31	10.26.78.10 – 10.26.78.11	10.26.78.11
7	10.26.78.12/31	10.26.78.12 – 10.26.78.13	10.26.78.13
8	10.26.78.14/31	10.26.78.14 – 10.26.78.15	10.26.78.15
9	10.26.78.16/31	10.26.78.16 – 10.26.78.17	10.26.78.17
10	10.26.78.18/31	10.26.78.18 – 10.26.78.19	10.26.78.19
11	10.26.78.20/31	10.26.78.20 – 10.26.78.21	10.26.78.21
12	10.26.78.22/31	10.26.78.22 – 10.26.78.23	10.26.78.23
13	10.26.78.24/31	10.26.78.24 – 10.26.78.25	10.26.78.25
14	10.26.78.26/31	10.26.78.26 – 10.26.78.27	10.26.78.27
15	10.26.78.28/31	10.26.78.28 – 10.26.78.29	10.26.78.29
16	10.26.78.30/31	10.26.78.30 – 10.26.78.31	10.26.78.31
17	10.26.78.32/31	10.26.78.32 – 10.26.78.33	10.26.78.33
18	10.26.78.34/31	10.26.78.34 – 10.26.78.35	10.26.78.35
19	10.26.78.36/31	10.26.78.36 – 10.26.78.37	10.26.78.37
20	10.26.78.38/31	10.26.78.38 – 10.26.78.39	10.26.78.39
21	10.26.78.40/31	10.26.78.40 – 10.26.78.41	10.26.78.41
22	10.26.78.42/31	10.26.78.42 – 10.26.78.43	10.26.78.43
23	10.26.78.44/31	10.26.78.44 – 10.26.78.45	10.26.78.45
24	10.26.78.46/31	10.26.78.46 – 10.26.78.47	10.26.78.47
25	10.26.78.48/31	10.26.78.48 – 10.26.78.49	10.26.78.49
26	10.26.78.50/31	10.26.78.50 – 10.26.78.51	10.26.78.51
27	10.26.78.52/31	10.26.78.52 – 10.26.78.53	10.26.78.53
28	10.26.78.54/31	10.26.78.54 – 10.26.78.55	10.26.78.55
29	10.26.78.56/31	10.26.78.56 – 10.26.78.57	10.26.78.57
30	10.26.78.58/31	10.26.78.58 – 10.26.78.59	10.26.78.59
31	10.26.78.60/31	10.26.78.60 – 10.26.78.61	10.26.78.61
32	10.26.78.62/31	10.26.78.62 – 10.26.78.63	10.26.78.63
33	10.26.78.64/31	10.26.78.64 – 10.26.78.65	10.26.78.65
34	10.26.78.66/31	10.26.78.66 – 10.26.78.67	10.26.78.67
35	10.26.78.68/31	10.26.78.68 – 10.26.78.69	10.26.78.69
36	10.26.78.70/31	10.26.78.70 – 10.26.78.71	10.26.78.71
37	10.26.78.72/31	10.26.78.72 – 10.26.78.73	10.26.78.73
38	10.26.78.74/31	10.26.78.74 – 10.26.78.75	10.26.78.75
39	10.26.78.76/31	10.26.78.76 – 10.26.78.77	10.26.78.77
40	10.26.78.78/31	10.26.78.78 – 10.26.78.79	10.26.78.79
41	10.26.78.80/31	10.26.78.80 – 10.26.78.81	10.26.78.81
42	10.26.78.82/31	10.26.78.82 – 10.26.78.83	10.26.78.83
43	10.26.78.84/31	10.26.78.84 – 10.26.78.85	10.26.78.85
44	10.26.78.86/31	10.26.78.86 – 10.26.78.87	10.26.78.87
45	10.26.78.88/31	10.26.78.88 – 10.26.78.89	10.26.78.89
46	10.26.78.90/31	10.26.78.90 – 10.26.78.91	10.26.78.91
47	10.26.78.92/31	10.26.78.92 – 10.26.78.93	10.26.78.93
48	10.26.78.94/31	10.26.78.94 – 10.26.78.95	10.26.78.95
49	10.26.78.96/31	10.26.78.96 – 10.26.78.97	10.26.78.97
50	10.26.78.98/31	10.26.78.98 – 10.26.78.99	10.26.78.99
51	10.26.78.100/31	10.26.78.100 – 10.26.78.101	10.26.78.101
52	10.26.78.102/31	10.26.78.102 – 10.26.78.103	10.26.78.103
53	10.26.78.104/31	10.26.78.104 – 10.26.78.105	10.26.78.105
54	10.26.78.106/31	10.26.78.106 – 10.26.78.107	10.26.78.107
55	10.26.78.108/31	10.26.78.108 – 10.26.78.109	10.26.78.109
56	10.26.78.110/31	10.26.78.110 – 10.26.78.111	10.26.78.111
57	10.26.78.112/31	10.26.78.112 – 10.26.78.113	10.26.78.113
58	10.26.78.114/31	10.26.78.114 – 10.26.78.115	10.26.78.115
59	10.26.78.116/31	10.26.78.116 – 10.26.78.117	10.26.78.117
60	10.26.78.118/31	10.26.78.118 – 10.26.78.119	10.26.78.119
61	10.26.78.120/31	10.26.78.120 – 10.26.78.121	10.26.78.121
62	10.26.78.122/31	10.26.78.122 – 10.26.78.123	10.26.78.123
63	10.26.78.124/31	10.26.78.124 – 10.26.78.125	10.26.78.125
64	10.26.78.126/31	10.26.78.126 – 10.26.78.127	10.26.78.127

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 /25
/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	1
/26	255.255.255.192	64	62	2 split →
/27	255.255.255.224	32	30	4 split →
/28	255.255.255.240	16	14	8 split →
/29	255.255.255.248	8	6	16 split →
/30	255.255.255.252	4	2	32 split →
/31	255.255.255.254	2	2	64 split →
/32	255.255.255.255	1	1	128 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 →