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)10.167.29.0/25

network10.167.29.0/25

broadcast10.167.29.127

first host10.167.29.1

last host10.167.29.126

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.167.29.0/25

address00001010.10100111.00011101.00000000

subnet mask11111111.11111111.11111111.10000000

network00001010.10100111.00011101.00000000

broadcast00001010.10100111.00011101.01111111

green = network part, grey = host part

hex0x0aa71d00

decimal178724096

reverse dns0.29.167.10.in-addr.arpa

ipv4-mapped::ffff:aa7:1d00

/25 split into /31 · 64 subnets

close ×

#	network	host range	broadcast
1	10.167.29.0/31	10.167.29.0 – 10.167.29.1	10.167.29.1
2	10.167.29.2/31	10.167.29.2 – 10.167.29.3	10.167.29.3
3	10.167.29.4/31	10.167.29.4 – 10.167.29.5	10.167.29.5
4	10.167.29.6/31	10.167.29.6 – 10.167.29.7	10.167.29.7
5	10.167.29.8/31	10.167.29.8 – 10.167.29.9	10.167.29.9
6	10.167.29.10/31	10.167.29.10 – 10.167.29.11	10.167.29.11
7	10.167.29.12/31	10.167.29.12 – 10.167.29.13	10.167.29.13
8	10.167.29.14/31	10.167.29.14 – 10.167.29.15	10.167.29.15
9	10.167.29.16/31	10.167.29.16 – 10.167.29.17	10.167.29.17
10	10.167.29.18/31	10.167.29.18 – 10.167.29.19	10.167.29.19
11	10.167.29.20/31	10.167.29.20 – 10.167.29.21	10.167.29.21
12	10.167.29.22/31	10.167.29.22 – 10.167.29.23	10.167.29.23
13	10.167.29.24/31	10.167.29.24 – 10.167.29.25	10.167.29.25
14	10.167.29.26/31	10.167.29.26 – 10.167.29.27	10.167.29.27
15	10.167.29.28/31	10.167.29.28 – 10.167.29.29	10.167.29.29
16	10.167.29.30/31	10.167.29.30 – 10.167.29.31	10.167.29.31
17	10.167.29.32/31	10.167.29.32 – 10.167.29.33	10.167.29.33
18	10.167.29.34/31	10.167.29.34 – 10.167.29.35	10.167.29.35
19	10.167.29.36/31	10.167.29.36 – 10.167.29.37	10.167.29.37
20	10.167.29.38/31	10.167.29.38 – 10.167.29.39	10.167.29.39
21	10.167.29.40/31	10.167.29.40 – 10.167.29.41	10.167.29.41
22	10.167.29.42/31	10.167.29.42 – 10.167.29.43	10.167.29.43
23	10.167.29.44/31	10.167.29.44 – 10.167.29.45	10.167.29.45
24	10.167.29.46/31	10.167.29.46 – 10.167.29.47	10.167.29.47
25	10.167.29.48/31	10.167.29.48 – 10.167.29.49	10.167.29.49
26	10.167.29.50/31	10.167.29.50 – 10.167.29.51	10.167.29.51
27	10.167.29.52/31	10.167.29.52 – 10.167.29.53	10.167.29.53
28	10.167.29.54/31	10.167.29.54 – 10.167.29.55	10.167.29.55
29	10.167.29.56/31	10.167.29.56 – 10.167.29.57	10.167.29.57
30	10.167.29.58/31	10.167.29.58 – 10.167.29.59	10.167.29.59
31	10.167.29.60/31	10.167.29.60 – 10.167.29.61	10.167.29.61
32	10.167.29.62/31	10.167.29.62 – 10.167.29.63	10.167.29.63
33	10.167.29.64/31	10.167.29.64 – 10.167.29.65	10.167.29.65
34	10.167.29.66/31	10.167.29.66 – 10.167.29.67	10.167.29.67
35	10.167.29.68/31	10.167.29.68 – 10.167.29.69	10.167.29.69
36	10.167.29.70/31	10.167.29.70 – 10.167.29.71	10.167.29.71
37	10.167.29.72/31	10.167.29.72 – 10.167.29.73	10.167.29.73
38	10.167.29.74/31	10.167.29.74 – 10.167.29.75	10.167.29.75
39	10.167.29.76/31	10.167.29.76 – 10.167.29.77	10.167.29.77
40	10.167.29.78/31	10.167.29.78 – 10.167.29.79	10.167.29.79
41	10.167.29.80/31	10.167.29.80 – 10.167.29.81	10.167.29.81
42	10.167.29.82/31	10.167.29.82 – 10.167.29.83	10.167.29.83
43	10.167.29.84/31	10.167.29.84 – 10.167.29.85	10.167.29.85
44	10.167.29.86/31	10.167.29.86 – 10.167.29.87	10.167.29.87
45	10.167.29.88/31	10.167.29.88 – 10.167.29.89	10.167.29.89
46	10.167.29.90/31	10.167.29.90 – 10.167.29.91	10.167.29.91
47	10.167.29.92/31	10.167.29.92 – 10.167.29.93	10.167.29.93
48	10.167.29.94/31	10.167.29.94 – 10.167.29.95	10.167.29.95
49	10.167.29.96/31	10.167.29.96 – 10.167.29.97	10.167.29.97
50	10.167.29.98/31	10.167.29.98 – 10.167.29.99	10.167.29.99
51	10.167.29.100/31	10.167.29.100 – 10.167.29.101	10.167.29.101
52	10.167.29.102/31	10.167.29.102 – 10.167.29.103	10.167.29.103
53	10.167.29.104/31	10.167.29.104 – 10.167.29.105	10.167.29.105
54	10.167.29.106/31	10.167.29.106 – 10.167.29.107	10.167.29.107
55	10.167.29.108/31	10.167.29.108 – 10.167.29.109	10.167.29.109
56	10.167.29.110/31	10.167.29.110 – 10.167.29.111	10.167.29.111
57	10.167.29.112/31	10.167.29.112 – 10.167.29.113	10.167.29.113
58	10.167.29.114/31	10.167.29.114 – 10.167.29.115	10.167.29.115
59	10.167.29.116/31	10.167.29.116 – 10.167.29.117	10.167.29.117
60	10.167.29.118/31	10.167.29.118 – 10.167.29.119	10.167.29.119
61	10.167.29.120/31	10.167.29.120 – 10.167.29.121	10.167.29.121
62	10.167.29.122/31	10.167.29.122 – 10.167.29.123	10.167.29.123
63	10.167.29.124/31	10.167.29.124 – 10.167.29.125	10.167.29.125
64	10.167.29.126/31	10.167.29.126 – 10.167.29.127	10.167.29.127

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 →