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)10.78.79.0/25

network10.78.79.0/25

broadcast10.78.79.127

first host10.78.79.1

last host10.78.79.126

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.78.79.0/25

address00001010.01001110.01001111.00000000

subnet mask11111111.11111111.11111111.10000000

network00001010.01001110.01001111.00000000

broadcast00001010.01001110.01001111.01111111

green = network part, grey = host part

hex0x0a4e4f00

decimal172904192

reverse dns0.79.78.10.in-addr.arpa

ipv4-mapped::ffff:a4e:4f00

/25 split into /31 · 64 subnets

close ×

#	network	host range	broadcast
1	10.78.79.0/31	10.78.79.0 – 10.78.79.1	10.78.79.1
2	10.78.79.2/31	10.78.79.2 – 10.78.79.3	10.78.79.3
3	10.78.79.4/31	10.78.79.4 – 10.78.79.5	10.78.79.5
4	10.78.79.6/31	10.78.79.6 – 10.78.79.7	10.78.79.7
5	10.78.79.8/31	10.78.79.8 – 10.78.79.9	10.78.79.9
6	10.78.79.10/31	10.78.79.10 – 10.78.79.11	10.78.79.11
7	10.78.79.12/31	10.78.79.12 – 10.78.79.13	10.78.79.13
8	10.78.79.14/31	10.78.79.14 – 10.78.79.15	10.78.79.15
9	10.78.79.16/31	10.78.79.16 – 10.78.79.17	10.78.79.17
10	10.78.79.18/31	10.78.79.18 – 10.78.79.19	10.78.79.19
11	10.78.79.20/31	10.78.79.20 – 10.78.79.21	10.78.79.21
12	10.78.79.22/31	10.78.79.22 – 10.78.79.23	10.78.79.23
13	10.78.79.24/31	10.78.79.24 – 10.78.79.25	10.78.79.25
14	10.78.79.26/31	10.78.79.26 – 10.78.79.27	10.78.79.27
15	10.78.79.28/31	10.78.79.28 – 10.78.79.29	10.78.79.29
16	10.78.79.30/31	10.78.79.30 – 10.78.79.31	10.78.79.31
17	10.78.79.32/31	10.78.79.32 – 10.78.79.33	10.78.79.33
18	10.78.79.34/31	10.78.79.34 – 10.78.79.35	10.78.79.35
19	10.78.79.36/31	10.78.79.36 – 10.78.79.37	10.78.79.37
20	10.78.79.38/31	10.78.79.38 – 10.78.79.39	10.78.79.39
21	10.78.79.40/31	10.78.79.40 – 10.78.79.41	10.78.79.41
22	10.78.79.42/31	10.78.79.42 – 10.78.79.43	10.78.79.43
23	10.78.79.44/31	10.78.79.44 – 10.78.79.45	10.78.79.45
24	10.78.79.46/31	10.78.79.46 – 10.78.79.47	10.78.79.47
25	10.78.79.48/31	10.78.79.48 – 10.78.79.49	10.78.79.49
26	10.78.79.50/31	10.78.79.50 – 10.78.79.51	10.78.79.51
27	10.78.79.52/31	10.78.79.52 – 10.78.79.53	10.78.79.53
28	10.78.79.54/31	10.78.79.54 – 10.78.79.55	10.78.79.55
29	10.78.79.56/31	10.78.79.56 – 10.78.79.57	10.78.79.57
30	10.78.79.58/31	10.78.79.58 – 10.78.79.59	10.78.79.59
31	10.78.79.60/31	10.78.79.60 – 10.78.79.61	10.78.79.61
32	10.78.79.62/31	10.78.79.62 – 10.78.79.63	10.78.79.63
33	10.78.79.64/31	10.78.79.64 – 10.78.79.65	10.78.79.65
34	10.78.79.66/31	10.78.79.66 – 10.78.79.67	10.78.79.67
35	10.78.79.68/31	10.78.79.68 – 10.78.79.69	10.78.79.69
36	10.78.79.70/31	10.78.79.70 – 10.78.79.71	10.78.79.71
37	10.78.79.72/31	10.78.79.72 – 10.78.79.73	10.78.79.73
38	10.78.79.74/31	10.78.79.74 – 10.78.79.75	10.78.79.75
39	10.78.79.76/31	10.78.79.76 – 10.78.79.77	10.78.79.77
40	10.78.79.78/31	10.78.79.78 – 10.78.79.79	10.78.79.79
41	10.78.79.80/31	10.78.79.80 – 10.78.79.81	10.78.79.81
42	10.78.79.82/31	10.78.79.82 – 10.78.79.83	10.78.79.83
43	10.78.79.84/31	10.78.79.84 – 10.78.79.85	10.78.79.85
44	10.78.79.86/31	10.78.79.86 – 10.78.79.87	10.78.79.87
45	10.78.79.88/31	10.78.79.88 – 10.78.79.89	10.78.79.89
46	10.78.79.90/31	10.78.79.90 – 10.78.79.91	10.78.79.91
47	10.78.79.92/31	10.78.79.92 – 10.78.79.93	10.78.79.93
48	10.78.79.94/31	10.78.79.94 – 10.78.79.95	10.78.79.95
49	10.78.79.96/31	10.78.79.96 – 10.78.79.97	10.78.79.97
50	10.78.79.98/31	10.78.79.98 – 10.78.79.99	10.78.79.99
51	10.78.79.100/31	10.78.79.100 – 10.78.79.101	10.78.79.101
52	10.78.79.102/31	10.78.79.102 – 10.78.79.103	10.78.79.103
53	10.78.79.104/31	10.78.79.104 – 10.78.79.105	10.78.79.105
54	10.78.79.106/31	10.78.79.106 – 10.78.79.107	10.78.79.107
55	10.78.79.108/31	10.78.79.108 – 10.78.79.109	10.78.79.109
56	10.78.79.110/31	10.78.79.110 – 10.78.79.111	10.78.79.111
57	10.78.79.112/31	10.78.79.112 – 10.78.79.113	10.78.79.113
58	10.78.79.114/31	10.78.79.114 – 10.78.79.115	10.78.79.115
59	10.78.79.116/31	10.78.79.116 – 10.78.79.117	10.78.79.117
60	10.78.79.118/31	10.78.79.118 – 10.78.79.119	10.78.79.119
61	10.78.79.120/31	10.78.79.120 – 10.78.79.121	10.78.79.121
62	10.78.79.122/31	10.78.79.122 – 10.78.79.123	10.78.79.123
63	10.78.79.124/31	10.78.79.124 – 10.78.79.125	10.78.79.125
64	10.78.79.126/31	10.78.79.126 – 10.78.79.127	10.78.79.127

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 →