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)10.167.25.0/25

network10.167.25.0/25

broadcast10.167.25.127

first host10.167.25.1

last host10.167.25.126

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.167.25.0/25

address00001010.10100111.00011001.00000000

subnet mask11111111.11111111.11111111.10000000

network00001010.10100111.00011001.00000000

broadcast00001010.10100111.00011001.01111111

green = network part, grey = host part

hex0x0aa71900

decimal178723072

reverse dns0.25.167.10.in-addr.arpa

ipv4-mapped::ffff:aa7:1900

/25 split into /31 · 64 subnets

close ×

#	network	host range	broadcast
1	10.167.25.0/31	10.167.25.0 – 10.167.25.1	10.167.25.1
2	10.167.25.2/31	10.167.25.2 – 10.167.25.3	10.167.25.3
3	10.167.25.4/31	10.167.25.4 – 10.167.25.5	10.167.25.5
4	10.167.25.6/31	10.167.25.6 – 10.167.25.7	10.167.25.7
5	10.167.25.8/31	10.167.25.8 – 10.167.25.9	10.167.25.9
6	10.167.25.10/31	10.167.25.10 – 10.167.25.11	10.167.25.11
7	10.167.25.12/31	10.167.25.12 – 10.167.25.13	10.167.25.13
8	10.167.25.14/31	10.167.25.14 – 10.167.25.15	10.167.25.15
9	10.167.25.16/31	10.167.25.16 – 10.167.25.17	10.167.25.17
10	10.167.25.18/31	10.167.25.18 – 10.167.25.19	10.167.25.19
11	10.167.25.20/31	10.167.25.20 – 10.167.25.21	10.167.25.21
12	10.167.25.22/31	10.167.25.22 – 10.167.25.23	10.167.25.23
13	10.167.25.24/31	10.167.25.24 – 10.167.25.25	10.167.25.25
14	10.167.25.26/31	10.167.25.26 – 10.167.25.27	10.167.25.27
15	10.167.25.28/31	10.167.25.28 – 10.167.25.29	10.167.25.29
16	10.167.25.30/31	10.167.25.30 – 10.167.25.31	10.167.25.31
17	10.167.25.32/31	10.167.25.32 – 10.167.25.33	10.167.25.33
18	10.167.25.34/31	10.167.25.34 – 10.167.25.35	10.167.25.35
19	10.167.25.36/31	10.167.25.36 – 10.167.25.37	10.167.25.37
20	10.167.25.38/31	10.167.25.38 – 10.167.25.39	10.167.25.39
21	10.167.25.40/31	10.167.25.40 – 10.167.25.41	10.167.25.41
22	10.167.25.42/31	10.167.25.42 – 10.167.25.43	10.167.25.43
23	10.167.25.44/31	10.167.25.44 – 10.167.25.45	10.167.25.45
24	10.167.25.46/31	10.167.25.46 – 10.167.25.47	10.167.25.47
25	10.167.25.48/31	10.167.25.48 – 10.167.25.49	10.167.25.49
26	10.167.25.50/31	10.167.25.50 – 10.167.25.51	10.167.25.51
27	10.167.25.52/31	10.167.25.52 – 10.167.25.53	10.167.25.53
28	10.167.25.54/31	10.167.25.54 – 10.167.25.55	10.167.25.55
29	10.167.25.56/31	10.167.25.56 – 10.167.25.57	10.167.25.57
30	10.167.25.58/31	10.167.25.58 – 10.167.25.59	10.167.25.59
31	10.167.25.60/31	10.167.25.60 – 10.167.25.61	10.167.25.61
32	10.167.25.62/31	10.167.25.62 – 10.167.25.63	10.167.25.63
33	10.167.25.64/31	10.167.25.64 – 10.167.25.65	10.167.25.65
34	10.167.25.66/31	10.167.25.66 – 10.167.25.67	10.167.25.67
35	10.167.25.68/31	10.167.25.68 – 10.167.25.69	10.167.25.69
36	10.167.25.70/31	10.167.25.70 – 10.167.25.71	10.167.25.71
37	10.167.25.72/31	10.167.25.72 – 10.167.25.73	10.167.25.73
38	10.167.25.74/31	10.167.25.74 – 10.167.25.75	10.167.25.75
39	10.167.25.76/31	10.167.25.76 – 10.167.25.77	10.167.25.77
40	10.167.25.78/31	10.167.25.78 – 10.167.25.79	10.167.25.79
41	10.167.25.80/31	10.167.25.80 – 10.167.25.81	10.167.25.81
42	10.167.25.82/31	10.167.25.82 – 10.167.25.83	10.167.25.83
43	10.167.25.84/31	10.167.25.84 – 10.167.25.85	10.167.25.85
44	10.167.25.86/31	10.167.25.86 – 10.167.25.87	10.167.25.87
45	10.167.25.88/31	10.167.25.88 – 10.167.25.89	10.167.25.89
46	10.167.25.90/31	10.167.25.90 – 10.167.25.91	10.167.25.91
47	10.167.25.92/31	10.167.25.92 – 10.167.25.93	10.167.25.93
48	10.167.25.94/31	10.167.25.94 – 10.167.25.95	10.167.25.95
49	10.167.25.96/31	10.167.25.96 – 10.167.25.97	10.167.25.97
50	10.167.25.98/31	10.167.25.98 – 10.167.25.99	10.167.25.99
51	10.167.25.100/31	10.167.25.100 – 10.167.25.101	10.167.25.101
52	10.167.25.102/31	10.167.25.102 – 10.167.25.103	10.167.25.103
53	10.167.25.104/31	10.167.25.104 – 10.167.25.105	10.167.25.105
54	10.167.25.106/31	10.167.25.106 – 10.167.25.107	10.167.25.107
55	10.167.25.108/31	10.167.25.108 – 10.167.25.109	10.167.25.109
56	10.167.25.110/31	10.167.25.110 – 10.167.25.111	10.167.25.111
57	10.167.25.112/31	10.167.25.112 – 10.167.25.113	10.167.25.113
58	10.167.25.114/31	10.167.25.114 – 10.167.25.115	10.167.25.115
59	10.167.25.116/31	10.167.25.116 – 10.167.25.117	10.167.25.117
60	10.167.25.118/31	10.167.25.118 – 10.167.25.119	10.167.25.119
61	10.167.25.120/31	10.167.25.120 – 10.167.25.121	10.167.25.121
62	10.167.25.122/31	10.167.25.122 – 10.167.25.123	10.167.25.123
63	10.167.25.124/31	10.167.25.124 – 10.167.25.125	10.167.25.125
64	10.167.25.126/31	10.167.25.126 – 10.167.25.127	10.167.25.127

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 →