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)10.2.182.0/25

network10.2.182.0/25

broadcast10.2.182.127

first host10.2.182.1

last host10.2.182.126

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.2.182.0/25

address00001010.00000010.10110110.00000000

subnet mask11111111.11111111.11111111.10000000

network00001010.00000010.10110110.00000000

broadcast00001010.00000010.10110110.01111111

green = network part, grey = host part

hex0x0a02b600

decimal167949824

reverse dns0.182.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:b600

/25 split into /31 · 64 subnets

close ×

#	network	host range	broadcast
1	10.2.182.0/31	10.2.182.0 – 10.2.182.1	10.2.182.1
2	10.2.182.2/31	10.2.182.2 – 10.2.182.3	10.2.182.3
3	10.2.182.4/31	10.2.182.4 – 10.2.182.5	10.2.182.5
4	10.2.182.6/31	10.2.182.6 – 10.2.182.7	10.2.182.7
5	10.2.182.8/31	10.2.182.8 – 10.2.182.9	10.2.182.9
6	10.2.182.10/31	10.2.182.10 – 10.2.182.11	10.2.182.11
7	10.2.182.12/31	10.2.182.12 – 10.2.182.13	10.2.182.13
8	10.2.182.14/31	10.2.182.14 – 10.2.182.15	10.2.182.15
9	10.2.182.16/31	10.2.182.16 – 10.2.182.17	10.2.182.17
10	10.2.182.18/31	10.2.182.18 – 10.2.182.19	10.2.182.19
11	10.2.182.20/31	10.2.182.20 – 10.2.182.21	10.2.182.21
12	10.2.182.22/31	10.2.182.22 – 10.2.182.23	10.2.182.23
13	10.2.182.24/31	10.2.182.24 – 10.2.182.25	10.2.182.25
14	10.2.182.26/31	10.2.182.26 – 10.2.182.27	10.2.182.27
15	10.2.182.28/31	10.2.182.28 – 10.2.182.29	10.2.182.29
16	10.2.182.30/31	10.2.182.30 – 10.2.182.31	10.2.182.31
17	10.2.182.32/31	10.2.182.32 – 10.2.182.33	10.2.182.33
18	10.2.182.34/31	10.2.182.34 – 10.2.182.35	10.2.182.35
19	10.2.182.36/31	10.2.182.36 – 10.2.182.37	10.2.182.37
20	10.2.182.38/31	10.2.182.38 – 10.2.182.39	10.2.182.39
21	10.2.182.40/31	10.2.182.40 – 10.2.182.41	10.2.182.41
22	10.2.182.42/31	10.2.182.42 – 10.2.182.43	10.2.182.43
23	10.2.182.44/31	10.2.182.44 – 10.2.182.45	10.2.182.45
24	10.2.182.46/31	10.2.182.46 – 10.2.182.47	10.2.182.47
25	10.2.182.48/31	10.2.182.48 – 10.2.182.49	10.2.182.49
26	10.2.182.50/31	10.2.182.50 – 10.2.182.51	10.2.182.51
27	10.2.182.52/31	10.2.182.52 – 10.2.182.53	10.2.182.53
28	10.2.182.54/31	10.2.182.54 – 10.2.182.55	10.2.182.55
29	10.2.182.56/31	10.2.182.56 – 10.2.182.57	10.2.182.57
30	10.2.182.58/31	10.2.182.58 – 10.2.182.59	10.2.182.59
31	10.2.182.60/31	10.2.182.60 – 10.2.182.61	10.2.182.61
32	10.2.182.62/31	10.2.182.62 – 10.2.182.63	10.2.182.63
33	10.2.182.64/31	10.2.182.64 – 10.2.182.65	10.2.182.65
34	10.2.182.66/31	10.2.182.66 – 10.2.182.67	10.2.182.67
35	10.2.182.68/31	10.2.182.68 – 10.2.182.69	10.2.182.69
36	10.2.182.70/31	10.2.182.70 – 10.2.182.71	10.2.182.71
37	10.2.182.72/31	10.2.182.72 – 10.2.182.73	10.2.182.73
38	10.2.182.74/31	10.2.182.74 – 10.2.182.75	10.2.182.75
39	10.2.182.76/31	10.2.182.76 – 10.2.182.77	10.2.182.77
40	10.2.182.78/31	10.2.182.78 – 10.2.182.79	10.2.182.79
41	10.2.182.80/31	10.2.182.80 – 10.2.182.81	10.2.182.81
42	10.2.182.82/31	10.2.182.82 – 10.2.182.83	10.2.182.83
43	10.2.182.84/31	10.2.182.84 – 10.2.182.85	10.2.182.85
44	10.2.182.86/31	10.2.182.86 – 10.2.182.87	10.2.182.87
45	10.2.182.88/31	10.2.182.88 – 10.2.182.89	10.2.182.89
46	10.2.182.90/31	10.2.182.90 – 10.2.182.91	10.2.182.91
47	10.2.182.92/31	10.2.182.92 – 10.2.182.93	10.2.182.93
48	10.2.182.94/31	10.2.182.94 – 10.2.182.95	10.2.182.95
49	10.2.182.96/31	10.2.182.96 – 10.2.182.97	10.2.182.97
50	10.2.182.98/31	10.2.182.98 – 10.2.182.99	10.2.182.99
51	10.2.182.100/31	10.2.182.100 – 10.2.182.101	10.2.182.101
52	10.2.182.102/31	10.2.182.102 – 10.2.182.103	10.2.182.103
53	10.2.182.104/31	10.2.182.104 – 10.2.182.105	10.2.182.105
54	10.2.182.106/31	10.2.182.106 – 10.2.182.107	10.2.182.107
55	10.2.182.108/31	10.2.182.108 – 10.2.182.109	10.2.182.109
56	10.2.182.110/31	10.2.182.110 – 10.2.182.111	10.2.182.111
57	10.2.182.112/31	10.2.182.112 – 10.2.182.113	10.2.182.113
58	10.2.182.114/31	10.2.182.114 – 10.2.182.115	10.2.182.115
59	10.2.182.116/31	10.2.182.116 – 10.2.182.117	10.2.182.117
60	10.2.182.118/31	10.2.182.118 – 10.2.182.119	10.2.182.119
61	10.2.182.120/31	10.2.182.120 – 10.2.182.121	10.2.182.121
62	10.2.182.122/31	10.2.182.122 – 10.2.182.123	10.2.182.123
63	10.2.182.124/31	10.2.182.124 – 10.2.182.125	10.2.182.125
64	10.2.182.126/31	10.2.182.126 – 10.2.182.127	10.2.182.127

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 →