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)10.167.67.0/25

network10.167.67.0/25

broadcast10.167.67.127

first host10.167.67.1

last host10.167.67.126

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.167.67.0/25

address00001010.10100111.01000011.00000000

subnet mask11111111.11111111.11111111.10000000

network00001010.10100111.01000011.00000000

broadcast00001010.10100111.01000011.01111111

green = network part, grey = host part

hex0x0aa74300

decimal178733824

reverse dns0.67.167.10.in-addr.arpa

ipv4-mapped::ffff:aa7:4300

/25 split into /31 · 64 subnets

close ×

#	network	host range	broadcast
1	10.167.67.0/31	10.167.67.0 – 10.167.67.1	10.167.67.1
2	10.167.67.2/31	10.167.67.2 – 10.167.67.3	10.167.67.3
3	10.167.67.4/31	10.167.67.4 – 10.167.67.5	10.167.67.5
4	10.167.67.6/31	10.167.67.6 – 10.167.67.7	10.167.67.7
5	10.167.67.8/31	10.167.67.8 – 10.167.67.9	10.167.67.9
6	10.167.67.10/31	10.167.67.10 – 10.167.67.11	10.167.67.11
7	10.167.67.12/31	10.167.67.12 – 10.167.67.13	10.167.67.13
8	10.167.67.14/31	10.167.67.14 – 10.167.67.15	10.167.67.15
9	10.167.67.16/31	10.167.67.16 – 10.167.67.17	10.167.67.17
10	10.167.67.18/31	10.167.67.18 – 10.167.67.19	10.167.67.19
11	10.167.67.20/31	10.167.67.20 – 10.167.67.21	10.167.67.21
12	10.167.67.22/31	10.167.67.22 – 10.167.67.23	10.167.67.23
13	10.167.67.24/31	10.167.67.24 – 10.167.67.25	10.167.67.25
14	10.167.67.26/31	10.167.67.26 – 10.167.67.27	10.167.67.27
15	10.167.67.28/31	10.167.67.28 – 10.167.67.29	10.167.67.29
16	10.167.67.30/31	10.167.67.30 – 10.167.67.31	10.167.67.31
17	10.167.67.32/31	10.167.67.32 – 10.167.67.33	10.167.67.33
18	10.167.67.34/31	10.167.67.34 – 10.167.67.35	10.167.67.35
19	10.167.67.36/31	10.167.67.36 – 10.167.67.37	10.167.67.37
20	10.167.67.38/31	10.167.67.38 – 10.167.67.39	10.167.67.39
21	10.167.67.40/31	10.167.67.40 – 10.167.67.41	10.167.67.41
22	10.167.67.42/31	10.167.67.42 – 10.167.67.43	10.167.67.43
23	10.167.67.44/31	10.167.67.44 – 10.167.67.45	10.167.67.45
24	10.167.67.46/31	10.167.67.46 – 10.167.67.47	10.167.67.47
25	10.167.67.48/31	10.167.67.48 – 10.167.67.49	10.167.67.49
26	10.167.67.50/31	10.167.67.50 – 10.167.67.51	10.167.67.51
27	10.167.67.52/31	10.167.67.52 – 10.167.67.53	10.167.67.53
28	10.167.67.54/31	10.167.67.54 – 10.167.67.55	10.167.67.55
29	10.167.67.56/31	10.167.67.56 – 10.167.67.57	10.167.67.57
30	10.167.67.58/31	10.167.67.58 – 10.167.67.59	10.167.67.59
31	10.167.67.60/31	10.167.67.60 – 10.167.67.61	10.167.67.61
32	10.167.67.62/31	10.167.67.62 – 10.167.67.63	10.167.67.63
33	10.167.67.64/31	10.167.67.64 – 10.167.67.65	10.167.67.65
34	10.167.67.66/31	10.167.67.66 – 10.167.67.67	10.167.67.67
35	10.167.67.68/31	10.167.67.68 – 10.167.67.69	10.167.67.69
36	10.167.67.70/31	10.167.67.70 – 10.167.67.71	10.167.67.71
37	10.167.67.72/31	10.167.67.72 – 10.167.67.73	10.167.67.73
38	10.167.67.74/31	10.167.67.74 – 10.167.67.75	10.167.67.75
39	10.167.67.76/31	10.167.67.76 – 10.167.67.77	10.167.67.77
40	10.167.67.78/31	10.167.67.78 – 10.167.67.79	10.167.67.79
41	10.167.67.80/31	10.167.67.80 – 10.167.67.81	10.167.67.81
42	10.167.67.82/31	10.167.67.82 – 10.167.67.83	10.167.67.83
43	10.167.67.84/31	10.167.67.84 – 10.167.67.85	10.167.67.85
44	10.167.67.86/31	10.167.67.86 – 10.167.67.87	10.167.67.87
45	10.167.67.88/31	10.167.67.88 – 10.167.67.89	10.167.67.89
46	10.167.67.90/31	10.167.67.90 – 10.167.67.91	10.167.67.91
47	10.167.67.92/31	10.167.67.92 – 10.167.67.93	10.167.67.93
48	10.167.67.94/31	10.167.67.94 – 10.167.67.95	10.167.67.95
49	10.167.67.96/31	10.167.67.96 – 10.167.67.97	10.167.67.97
50	10.167.67.98/31	10.167.67.98 – 10.167.67.99	10.167.67.99
51	10.167.67.100/31	10.167.67.100 – 10.167.67.101	10.167.67.101
52	10.167.67.102/31	10.167.67.102 – 10.167.67.103	10.167.67.103
53	10.167.67.104/31	10.167.67.104 – 10.167.67.105	10.167.67.105
54	10.167.67.106/31	10.167.67.106 – 10.167.67.107	10.167.67.107
55	10.167.67.108/31	10.167.67.108 – 10.167.67.109	10.167.67.109
56	10.167.67.110/31	10.167.67.110 – 10.167.67.111	10.167.67.111
57	10.167.67.112/31	10.167.67.112 – 10.167.67.113	10.167.67.113
58	10.167.67.114/31	10.167.67.114 – 10.167.67.115	10.167.67.115
59	10.167.67.116/31	10.167.67.116 – 10.167.67.117	10.167.67.117
60	10.167.67.118/31	10.167.67.118 – 10.167.67.119	10.167.67.119
61	10.167.67.120/31	10.167.67.120 – 10.167.67.121	10.167.67.121
62	10.167.67.122/31	10.167.67.122 – 10.167.67.123	10.167.67.123
63	10.167.67.124/31	10.167.67.124 – 10.167.67.125	10.167.67.125
64	10.167.67.126/31	10.167.67.126 – 10.167.67.127	10.167.67.127

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 →