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)10.167.188.0/25

network10.167.188.0/25

broadcast10.167.188.127

first host10.167.188.1

last host10.167.188.126

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.167.188.0/25

address00001010.10100111.10111100.00000000

subnet mask11111111.11111111.11111111.10000000

network00001010.10100111.10111100.00000000

broadcast00001010.10100111.10111100.01111111

green = network part, grey = host part

hex0x0aa7bc00

decimal178764800

reverse dns0.188.167.10.in-addr.arpa

ipv4-mapped::ffff:aa7:bc00

/25 split into /31 · 64 subnets

close ×

#	network	host range	broadcast
1	10.167.188.0/31	10.167.188.0 – 10.167.188.1	10.167.188.1
2	10.167.188.2/31	10.167.188.2 – 10.167.188.3	10.167.188.3
3	10.167.188.4/31	10.167.188.4 – 10.167.188.5	10.167.188.5
4	10.167.188.6/31	10.167.188.6 – 10.167.188.7	10.167.188.7
5	10.167.188.8/31	10.167.188.8 – 10.167.188.9	10.167.188.9
6	10.167.188.10/31	10.167.188.10 – 10.167.188.11	10.167.188.11
7	10.167.188.12/31	10.167.188.12 – 10.167.188.13	10.167.188.13
8	10.167.188.14/31	10.167.188.14 – 10.167.188.15	10.167.188.15
9	10.167.188.16/31	10.167.188.16 – 10.167.188.17	10.167.188.17
10	10.167.188.18/31	10.167.188.18 – 10.167.188.19	10.167.188.19
11	10.167.188.20/31	10.167.188.20 – 10.167.188.21	10.167.188.21
12	10.167.188.22/31	10.167.188.22 – 10.167.188.23	10.167.188.23
13	10.167.188.24/31	10.167.188.24 – 10.167.188.25	10.167.188.25
14	10.167.188.26/31	10.167.188.26 – 10.167.188.27	10.167.188.27
15	10.167.188.28/31	10.167.188.28 – 10.167.188.29	10.167.188.29
16	10.167.188.30/31	10.167.188.30 – 10.167.188.31	10.167.188.31
17	10.167.188.32/31	10.167.188.32 – 10.167.188.33	10.167.188.33
18	10.167.188.34/31	10.167.188.34 – 10.167.188.35	10.167.188.35
19	10.167.188.36/31	10.167.188.36 – 10.167.188.37	10.167.188.37
20	10.167.188.38/31	10.167.188.38 – 10.167.188.39	10.167.188.39
21	10.167.188.40/31	10.167.188.40 – 10.167.188.41	10.167.188.41
22	10.167.188.42/31	10.167.188.42 – 10.167.188.43	10.167.188.43
23	10.167.188.44/31	10.167.188.44 – 10.167.188.45	10.167.188.45
24	10.167.188.46/31	10.167.188.46 – 10.167.188.47	10.167.188.47
25	10.167.188.48/31	10.167.188.48 – 10.167.188.49	10.167.188.49
26	10.167.188.50/31	10.167.188.50 – 10.167.188.51	10.167.188.51
27	10.167.188.52/31	10.167.188.52 – 10.167.188.53	10.167.188.53
28	10.167.188.54/31	10.167.188.54 – 10.167.188.55	10.167.188.55
29	10.167.188.56/31	10.167.188.56 – 10.167.188.57	10.167.188.57
30	10.167.188.58/31	10.167.188.58 – 10.167.188.59	10.167.188.59
31	10.167.188.60/31	10.167.188.60 – 10.167.188.61	10.167.188.61
32	10.167.188.62/31	10.167.188.62 – 10.167.188.63	10.167.188.63
33	10.167.188.64/31	10.167.188.64 – 10.167.188.65	10.167.188.65
34	10.167.188.66/31	10.167.188.66 – 10.167.188.67	10.167.188.67
35	10.167.188.68/31	10.167.188.68 – 10.167.188.69	10.167.188.69
36	10.167.188.70/31	10.167.188.70 – 10.167.188.71	10.167.188.71
37	10.167.188.72/31	10.167.188.72 – 10.167.188.73	10.167.188.73
38	10.167.188.74/31	10.167.188.74 – 10.167.188.75	10.167.188.75
39	10.167.188.76/31	10.167.188.76 – 10.167.188.77	10.167.188.77
40	10.167.188.78/31	10.167.188.78 – 10.167.188.79	10.167.188.79
41	10.167.188.80/31	10.167.188.80 – 10.167.188.81	10.167.188.81
42	10.167.188.82/31	10.167.188.82 – 10.167.188.83	10.167.188.83
43	10.167.188.84/31	10.167.188.84 – 10.167.188.85	10.167.188.85
44	10.167.188.86/31	10.167.188.86 – 10.167.188.87	10.167.188.87
45	10.167.188.88/31	10.167.188.88 – 10.167.188.89	10.167.188.89
46	10.167.188.90/31	10.167.188.90 – 10.167.188.91	10.167.188.91
47	10.167.188.92/31	10.167.188.92 – 10.167.188.93	10.167.188.93
48	10.167.188.94/31	10.167.188.94 – 10.167.188.95	10.167.188.95
49	10.167.188.96/31	10.167.188.96 – 10.167.188.97	10.167.188.97
50	10.167.188.98/31	10.167.188.98 – 10.167.188.99	10.167.188.99
51	10.167.188.100/31	10.167.188.100 – 10.167.188.101	10.167.188.101
52	10.167.188.102/31	10.167.188.102 – 10.167.188.103	10.167.188.103
53	10.167.188.104/31	10.167.188.104 – 10.167.188.105	10.167.188.105
54	10.167.188.106/31	10.167.188.106 – 10.167.188.107	10.167.188.107
55	10.167.188.108/31	10.167.188.108 – 10.167.188.109	10.167.188.109
56	10.167.188.110/31	10.167.188.110 – 10.167.188.111	10.167.188.111
57	10.167.188.112/31	10.167.188.112 – 10.167.188.113	10.167.188.113
58	10.167.188.114/31	10.167.188.114 – 10.167.188.115	10.167.188.115
59	10.167.188.116/31	10.167.188.116 – 10.167.188.117	10.167.188.117
60	10.167.188.118/31	10.167.188.118 – 10.167.188.119	10.167.188.119
61	10.167.188.120/31	10.167.188.120 – 10.167.188.121	10.167.188.121
62	10.167.188.122/31	10.167.188.122 – 10.167.188.123	10.167.188.123
63	10.167.188.124/31	10.167.188.124 – 10.167.188.125	10.167.188.125
64	10.167.188.126/31	10.167.188.126 – 10.167.188.127	10.167.188.127

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 →