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)10.167.34.0/25

network10.167.34.0/25

broadcast10.167.34.127

first host10.167.34.1

last host10.167.34.126

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.167.34.0/25

address00001010.10100111.00100010.00000000

subnet mask11111111.11111111.11111111.10000000

network00001010.10100111.00100010.00000000

broadcast00001010.10100111.00100010.01111111

green = network part, grey = host part

hex0x0aa72200

decimal178725376

reverse dns0.34.167.10.in-addr.arpa

ipv4-mapped::ffff:aa7:2200

/25 split into /31 · 64 subnets

close ×

#	network	host range	broadcast
1	10.167.34.0/31	10.167.34.0 – 10.167.34.1	10.167.34.1
2	10.167.34.2/31	10.167.34.2 – 10.167.34.3	10.167.34.3
3	10.167.34.4/31	10.167.34.4 – 10.167.34.5	10.167.34.5
4	10.167.34.6/31	10.167.34.6 – 10.167.34.7	10.167.34.7
5	10.167.34.8/31	10.167.34.8 – 10.167.34.9	10.167.34.9
6	10.167.34.10/31	10.167.34.10 – 10.167.34.11	10.167.34.11
7	10.167.34.12/31	10.167.34.12 – 10.167.34.13	10.167.34.13
8	10.167.34.14/31	10.167.34.14 – 10.167.34.15	10.167.34.15
9	10.167.34.16/31	10.167.34.16 – 10.167.34.17	10.167.34.17
10	10.167.34.18/31	10.167.34.18 – 10.167.34.19	10.167.34.19
11	10.167.34.20/31	10.167.34.20 – 10.167.34.21	10.167.34.21
12	10.167.34.22/31	10.167.34.22 – 10.167.34.23	10.167.34.23
13	10.167.34.24/31	10.167.34.24 – 10.167.34.25	10.167.34.25
14	10.167.34.26/31	10.167.34.26 – 10.167.34.27	10.167.34.27
15	10.167.34.28/31	10.167.34.28 – 10.167.34.29	10.167.34.29
16	10.167.34.30/31	10.167.34.30 – 10.167.34.31	10.167.34.31
17	10.167.34.32/31	10.167.34.32 – 10.167.34.33	10.167.34.33
18	10.167.34.34/31	10.167.34.34 – 10.167.34.35	10.167.34.35
19	10.167.34.36/31	10.167.34.36 – 10.167.34.37	10.167.34.37
20	10.167.34.38/31	10.167.34.38 – 10.167.34.39	10.167.34.39
21	10.167.34.40/31	10.167.34.40 – 10.167.34.41	10.167.34.41
22	10.167.34.42/31	10.167.34.42 – 10.167.34.43	10.167.34.43
23	10.167.34.44/31	10.167.34.44 – 10.167.34.45	10.167.34.45
24	10.167.34.46/31	10.167.34.46 – 10.167.34.47	10.167.34.47
25	10.167.34.48/31	10.167.34.48 – 10.167.34.49	10.167.34.49
26	10.167.34.50/31	10.167.34.50 – 10.167.34.51	10.167.34.51
27	10.167.34.52/31	10.167.34.52 – 10.167.34.53	10.167.34.53
28	10.167.34.54/31	10.167.34.54 – 10.167.34.55	10.167.34.55
29	10.167.34.56/31	10.167.34.56 – 10.167.34.57	10.167.34.57
30	10.167.34.58/31	10.167.34.58 – 10.167.34.59	10.167.34.59
31	10.167.34.60/31	10.167.34.60 – 10.167.34.61	10.167.34.61
32	10.167.34.62/31	10.167.34.62 – 10.167.34.63	10.167.34.63
33	10.167.34.64/31	10.167.34.64 – 10.167.34.65	10.167.34.65
34	10.167.34.66/31	10.167.34.66 – 10.167.34.67	10.167.34.67
35	10.167.34.68/31	10.167.34.68 – 10.167.34.69	10.167.34.69
36	10.167.34.70/31	10.167.34.70 – 10.167.34.71	10.167.34.71
37	10.167.34.72/31	10.167.34.72 – 10.167.34.73	10.167.34.73
38	10.167.34.74/31	10.167.34.74 – 10.167.34.75	10.167.34.75
39	10.167.34.76/31	10.167.34.76 – 10.167.34.77	10.167.34.77
40	10.167.34.78/31	10.167.34.78 – 10.167.34.79	10.167.34.79
41	10.167.34.80/31	10.167.34.80 – 10.167.34.81	10.167.34.81
42	10.167.34.82/31	10.167.34.82 – 10.167.34.83	10.167.34.83
43	10.167.34.84/31	10.167.34.84 – 10.167.34.85	10.167.34.85
44	10.167.34.86/31	10.167.34.86 – 10.167.34.87	10.167.34.87
45	10.167.34.88/31	10.167.34.88 – 10.167.34.89	10.167.34.89
46	10.167.34.90/31	10.167.34.90 – 10.167.34.91	10.167.34.91
47	10.167.34.92/31	10.167.34.92 – 10.167.34.93	10.167.34.93
48	10.167.34.94/31	10.167.34.94 – 10.167.34.95	10.167.34.95
49	10.167.34.96/31	10.167.34.96 – 10.167.34.97	10.167.34.97
50	10.167.34.98/31	10.167.34.98 – 10.167.34.99	10.167.34.99
51	10.167.34.100/31	10.167.34.100 – 10.167.34.101	10.167.34.101
52	10.167.34.102/31	10.167.34.102 – 10.167.34.103	10.167.34.103
53	10.167.34.104/31	10.167.34.104 – 10.167.34.105	10.167.34.105
54	10.167.34.106/31	10.167.34.106 – 10.167.34.107	10.167.34.107
55	10.167.34.108/31	10.167.34.108 – 10.167.34.109	10.167.34.109
56	10.167.34.110/31	10.167.34.110 – 10.167.34.111	10.167.34.111
57	10.167.34.112/31	10.167.34.112 – 10.167.34.113	10.167.34.113
58	10.167.34.114/31	10.167.34.114 – 10.167.34.115	10.167.34.115
59	10.167.34.116/31	10.167.34.116 – 10.167.34.117	10.167.34.117
60	10.167.34.118/31	10.167.34.118 – 10.167.34.119	10.167.34.119
61	10.167.34.120/31	10.167.34.120 – 10.167.34.121	10.167.34.121
62	10.167.34.122/31	10.167.34.122 – 10.167.34.123	10.167.34.123
63	10.167.34.124/31	10.167.34.124 – 10.167.34.125	10.167.34.125
64	10.167.34.126/31	10.167.34.126 – 10.167.34.127	10.167.34.127

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 →