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)10.2.112.0/25

network10.2.112.0/25

broadcast10.2.112.127

first host10.2.112.1

last host10.2.112.126

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.2.112.0/25

address00001010.00000010.01110000.00000000

subnet mask11111111.11111111.11111111.10000000

network00001010.00000010.01110000.00000000

broadcast00001010.00000010.01110000.01111111

green = network part, grey = host part

hex0x0a027000

decimal167931904

reverse dns0.112.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:7000

/25 split into /31 · 64 subnets

close ×

#	network	host range	broadcast
1	10.2.112.0/31	10.2.112.0 – 10.2.112.1	10.2.112.1
2	10.2.112.2/31	10.2.112.2 – 10.2.112.3	10.2.112.3
3	10.2.112.4/31	10.2.112.4 – 10.2.112.5	10.2.112.5
4	10.2.112.6/31	10.2.112.6 – 10.2.112.7	10.2.112.7
5	10.2.112.8/31	10.2.112.8 – 10.2.112.9	10.2.112.9
6	10.2.112.10/31	10.2.112.10 – 10.2.112.11	10.2.112.11
7	10.2.112.12/31	10.2.112.12 – 10.2.112.13	10.2.112.13
8	10.2.112.14/31	10.2.112.14 – 10.2.112.15	10.2.112.15
9	10.2.112.16/31	10.2.112.16 – 10.2.112.17	10.2.112.17
10	10.2.112.18/31	10.2.112.18 – 10.2.112.19	10.2.112.19
11	10.2.112.20/31	10.2.112.20 – 10.2.112.21	10.2.112.21
12	10.2.112.22/31	10.2.112.22 – 10.2.112.23	10.2.112.23
13	10.2.112.24/31	10.2.112.24 – 10.2.112.25	10.2.112.25
14	10.2.112.26/31	10.2.112.26 – 10.2.112.27	10.2.112.27
15	10.2.112.28/31	10.2.112.28 – 10.2.112.29	10.2.112.29
16	10.2.112.30/31	10.2.112.30 – 10.2.112.31	10.2.112.31
17	10.2.112.32/31	10.2.112.32 – 10.2.112.33	10.2.112.33
18	10.2.112.34/31	10.2.112.34 – 10.2.112.35	10.2.112.35
19	10.2.112.36/31	10.2.112.36 – 10.2.112.37	10.2.112.37
20	10.2.112.38/31	10.2.112.38 – 10.2.112.39	10.2.112.39
21	10.2.112.40/31	10.2.112.40 – 10.2.112.41	10.2.112.41
22	10.2.112.42/31	10.2.112.42 – 10.2.112.43	10.2.112.43
23	10.2.112.44/31	10.2.112.44 – 10.2.112.45	10.2.112.45
24	10.2.112.46/31	10.2.112.46 – 10.2.112.47	10.2.112.47
25	10.2.112.48/31	10.2.112.48 – 10.2.112.49	10.2.112.49
26	10.2.112.50/31	10.2.112.50 – 10.2.112.51	10.2.112.51
27	10.2.112.52/31	10.2.112.52 – 10.2.112.53	10.2.112.53
28	10.2.112.54/31	10.2.112.54 – 10.2.112.55	10.2.112.55
29	10.2.112.56/31	10.2.112.56 – 10.2.112.57	10.2.112.57
30	10.2.112.58/31	10.2.112.58 – 10.2.112.59	10.2.112.59
31	10.2.112.60/31	10.2.112.60 – 10.2.112.61	10.2.112.61
32	10.2.112.62/31	10.2.112.62 – 10.2.112.63	10.2.112.63
33	10.2.112.64/31	10.2.112.64 – 10.2.112.65	10.2.112.65
34	10.2.112.66/31	10.2.112.66 – 10.2.112.67	10.2.112.67
35	10.2.112.68/31	10.2.112.68 – 10.2.112.69	10.2.112.69
36	10.2.112.70/31	10.2.112.70 – 10.2.112.71	10.2.112.71
37	10.2.112.72/31	10.2.112.72 – 10.2.112.73	10.2.112.73
38	10.2.112.74/31	10.2.112.74 – 10.2.112.75	10.2.112.75
39	10.2.112.76/31	10.2.112.76 – 10.2.112.77	10.2.112.77
40	10.2.112.78/31	10.2.112.78 – 10.2.112.79	10.2.112.79
41	10.2.112.80/31	10.2.112.80 – 10.2.112.81	10.2.112.81
42	10.2.112.82/31	10.2.112.82 – 10.2.112.83	10.2.112.83
43	10.2.112.84/31	10.2.112.84 – 10.2.112.85	10.2.112.85
44	10.2.112.86/31	10.2.112.86 – 10.2.112.87	10.2.112.87
45	10.2.112.88/31	10.2.112.88 – 10.2.112.89	10.2.112.89
46	10.2.112.90/31	10.2.112.90 – 10.2.112.91	10.2.112.91
47	10.2.112.92/31	10.2.112.92 – 10.2.112.93	10.2.112.93
48	10.2.112.94/31	10.2.112.94 – 10.2.112.95	10.2.112.95
49	10.2.112.96/31	10.2.112.96 – 10.2.112.97	10.2.112.97
50	10.2.112.98/31	10.2.112.98 – 10.2.112.99	10.2.112.99
51	10.2.112.100/31	10.2.112.100 – 10.2.112.101	10.2.112.101
52	10.2.112.102/31	10.2.112.102 – 10.2.112.103	10.2.112.103
53	10.2.112.104/31	10.2.112.104 – 10.2.112.105	10.2.112.105
54	10.2.112.106/31	10.2.112.106 – 10.2.112.107	10.2.112.107
55	10.2.112.108/31	10.2.112.108 – 10.2.112.109	10.2.112.109
56	10.2.112.110/31	10.2.112.110 – 10.2.112.111	10.2.112.111
57	10.2.112.112/31	10.2.112.112 – 10.2.112.113	10.2.112.113
58	10.2.112.114/31	10.2.112.114 – 10.2.112.115	10.2.112.115
59	10.2.112.116/31	10.2.112.116 – 10.2.112.117	10.2.112.117
60	10.2.112.118/31	10.2.112.118 – 10.2.112.119	10.2.112.119
61	10.2.112.120/31	10.2.112.120 – 10.2.112.121	10.2.112.121
62	10.2.112.122/31	10.2.112.122 – 10.2.112.123	10.2.112.123
63	10.2.112.124/31	10.2.112.124 – 10.2.112.125	10.2.112.125
64	10.2.112.126/31	10.2.112.126 – 10.2.112.127	10.2.112.127

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 →