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)10.25.167.0/25

network10.25.167.0/25

broadcast10.25.167.127

first host10.25.167.1

last host10.25.167.126

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.25.167.0/25

address00001010.00011001.10100111.00000000

subnet mask11111111.11111111.11111111.10000000

network00001010.00011001.10100111.00000000

broadcast00001010.00011001.10100111.01111111

green = network part, grey = host part

hex0x0a19a700

decimal169453312

reverse dns0.167.25.10.in-addr.arpa

ipv4-mapped::ffff:a19:a700

/25 split into /31 · 64 subnets

close ×

#	network	host range	broadcast
1	10.25.167.0/31	10.25.167.0 – 10.25.167.1	10.25.167.1
2	10.25.167.2/31	10.25.167.2 – 10.25.167.3	10.25.167.3
3	10.25.167.4/31	10.25.167.4 – 10.25.167.5	10.25.167.5
4	10.25.167.6/31	10.25.167.6 – 10.25.167.7	10.25.167.7
5	10.25.167.8/31	10.25.167.8 – 10.25.167.9	10.25.167.9
6	10.25.167.10/31	10.25.167.10 – 10.25.167.11	10.25.167.11
7	10.25.167.12/31	10.25.167.12 – 10.25.167.13	10.25.167.13
8	10.25.167.14/31	10.25.167.14 – 10.25.167.15	10.25.167.15
9	10.25.167.16/31	10.25.167.16 – 10.25.167.17	10.25.167.17
10	10.25.167.18/31	10.25.167.18 – 10.25.167.19	10.25.167.19
11	10.25.167.20/31	10.25.167.20 – 10.25.167.21	10.25.167.21
12	10.25.167.22/31	10.25.167.22 – 10.25.167.23	10.25.167.23
13	10.25.167.24/31	10.25.167.24 – 10.25.167.25	10.25.167.25
14	10.25.167.26/31	10.25.167.26 – 10.25.167.27	10.25.167.27
15	10.25.167.28/31	10.25.167.28 – 10.25.167.29	10.25.167.29
16	10.25.167.30/31	10.25.167.30 – 10.25.167.31	10.25.167.31
17	10.25.167.32/31	10.25.167.32 – 10.25.167.33	10.25.167.33
18	10.25.167.34/31	10.25.167.34 – 10.25.167.35	10.25.167.35
19	10.25.167.36/31	10.25.167.36 – 10.25.167.37	10.25.167.37
20	10.25.167.38/31	10.25.167.38 – 10.25.167.39	10.25.167.39
21	10.25.167.40/31	10.25.167.40 – 10.25.167.41	10.25.167.41
22	10.25.167.42/31	10.25.167.42 – 10.25.167.43	10.25.167.43
23	10.25.167.44/31	10.25.167.44 – 10.25.167.45	10.25.167.45
24	10.25.167.46/31	10.25.167.46 – 10.25.167.47	10.25.167.47
25	10.25.167.48/31	10.25.167.48 – 10.25.167.49	10.25.167.49
26	10.25.167.50/31	10.25.167.50 – 10.25.167.51	10.25.167.51
27	10.25.167.52/31	10.25.167.52 – 10.25.167.53	10.25.167.53
28	10.25.167.54/31	10.25.167.54 – 10.25.167.55	10.25.167.55
29	10.25.167.56/31	10.25.167.56 – 10.25.167.57	10.25.167.57
30	10.25.167.58/31	10.25.167.58 – 10.25.167.59	10.25.167.59
31	10.25.167.60/31	10.25.167.60 – 10.25.167.61	10.25.167.61
32	10.25.167.62/31	10.25.167.62 – 10.25.167.63	10.25.167.63
33	10.25.167.64/31	10.25.167.64 – 10.25.167.65	10.25.167.65
34	10.25.167.66/31	10.25.167.66 – 10.25.167.67	10.25.167.67
35	10.25.167.68/31	10.25.167.68 – 10.25.167.69	10.25.167.69
36	10.25.167.70/31	10.25.167.70 – 10.25.167.71	10.25.167.71
37	10.25.167.72/31	10.25.167.72 – 10.25.167.73	10.25.167.73
38	10.25.167.74/31	10.25.167.74 – 10.25.167.75	10.25.167.75
39	10.25.167.76/31	10.25.167.76 – 10.25.167.77	10.25.167.77
40	10.25.167.78/31	10.25.167.78 – 10.25.167.79	10.25.167.79
41	10.25.167.80/31	10.25.167.80 – 10.25.167.81	10.25.167.81
42	10.25.167.82/31	10.25.167.82 – 10.25.167.83	10.25.167.83
43	10.25.167.84/31	10.25.167.84 – 10.25.167.85	10.25.167.85
44	10.25.167.86/31	10.25.167.86 – 10.25.167.87	10.25.167.87
45	10.25.167.88/31	10.25.167.88 – 10.25.167.89	10.25.167.89
46	10.25.167.90/31	10.25.167.90 – 10.25.167.91	10.25.167.91
47	10.25.167.92/31	10.25.167.92 – 10.25.167.93	10.25.167.93
48	10.25.167.94/31	10.25.167.94 – 10.25.167.95	10.25.167.95
49	10.25.167.96/31	10.25.167.96 – 10.25.167.97	10.25.167.97
50	10.25.167.98/31	10.25.167.98 – 10.25.167.99	10.25.167.99
51	10.25.167.100/31	10.25.167.100 – 10.25.167.101	10.25.167.101
52	10.25.167.102/31	10.25.167.102 – 10.25.167.103	10.25.167.103
53	10.25.167.104/31	10.25.167.104 – 10.25.167.105	10.25.167.105
54	10.25.167.106/31	10.25.167.106 – 10.25.167.107	10.25.167.107
55	10.25.167.108/31	10.25.167.108 – 10.25.167.109	10.25.167.109
56	10.25.167.110/31	10.25.167.110 – 10.25.167.111	10.25.167.111
57	10.25.167.112/31	10.25.167.112 – 10.25.167.113	10.25.167.113
58	10.25.167.114/31	10.25.167.114 – 10.25.167.115	10.25.167.115
59	10.25.167.116/31	10.25.167.116 – 10.25.167.117	10.25.167.117
60	10.25.167.118/31	10.25.167.118 – 10.25.167.119	10.25.167.119
61	10.25.167.120/31	10.25.167.120 – 10.25.167.121	10.25.167.121
62	10.25.167.122/31	10.25.167.122 – 10.25.167.123	10.25.167.123
63	10.25.167.124/31	10.25.167.124 – 10.25.167.125	10.25.167.125
64	10.25.167.126/31	10.25.167.126 – 10.25.167.127	10.25.167.127

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 →