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)10.167.61.0/25

network10.167.61.0/25

broadcast10.167.61.127

first host10.167.61.1

last host10.167.61.126

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.167.61.0/25

address00001010.10100111.00111101.00000000

subnet mask11111111.11111111.11111111.10000000

network00001010.10100111.00111101.00000000

broadcast00001010.10100111.00111101.01111111

green = network part, grey = host part

hex0x0aa73d00

decimal178732288

reverse dns0.61.167.10.in-addr.arpa

ipv4-mapped::ffff:aa7:3d00

/25 split into /31 · 64 subnets

close ×

#	network	host range	broadcast
1	10.167.61.0/31	10.167.61.0 – 10.167.61.1	10.167.61.1
2	10.167.61.2/31	10.167.61.2 – 10.167.61.3	10.167.61.3
3	10.167.61.4/31	10.167.61.4 – 10.167.61.5	10.167.61.5
4	10.167.61.6/31	10.167.61.6 – 10.167.61.7	10.167.61.7
5	10.167.61.8/31	10.167.61.8 – 10.167.61.9	10.167.61.9
6	10.167.61.10/31	10.167.61.10 – 10.167.61.11	10.167.61.11
7	10.167.61.12/31	10.167.61.12 – 10.167.61.13	10.167.61.13
8	10.167.61.14/31	10.167.61.14 – 10.167.61.15	10.167.61.15
9	10.167.61.16/31	10.167.61.16 – 10.167.61.17	10.167.61.17
10	10.167.61.18/31	10.167.61.18 – 10.167.61.19	10.167.61.19
11	10.167.61.20/31	10.167.61.20 – 10.167.61.21	10.167.61.21
12	10.167.61.22/31	10.167.61.22 – 10.167.61.23	10.167.61.23
13	10.167.61.24/31	10.167.61.24 – 10.167.61.25	10.167.61.25
14	10.167.61.26/31	10.167.61.26 – 10.167.61.27	10.167.61.27
15	10.167.61.28/31	10.167.61.28 – 10.167.61.29	10.167.61.29
16	10.167.61.30/31	10.167.61.30 – 10.167.61.31	10.167.61.31
17	10.167.61.32/31	10.167.61.32 – 10.167.61.33	10.167.61.33
18	10.167.61.34/31	10.167.61.34 – 10.167.61.35	10.167.61.35
19	10.167.61.36/31	10.167.61.36 – 10.167.61.37	10.167.61.37
20	10.167.61.38/31	10.167.61.38 – 10.167.61.39	10.167.61.39
21	10.167.61.40/31	10.167.61.40 – 10.167.61.41	10.167.61.41
22	10.167.61.42/31	10.167.61.42 – 10.167.61.43	10.167.61.43
23	10.167.61.44/31	10.167.61.44 – 10.167.61.45	10.167.61.45
24	10.167.61.46/31	10.167.61.46 – 10.167.61.47	10.167.61.47
25	10.167.61.48/31	10.167.61.48 – 10.167.61.49	10.167.61.49
26	10.167.61.50/31	10.167.61.50 – 10.167.61.51	10.167.61.51
27	10.167.61.52/31	10.167.61.52 – 10.167.61.53	10.167.61.53
28	10.167.61.54/31	10.167.61.54 – 10.167.61.55	10.167.61.55
29	10.167.61.56/31	10.167.61.56 – 10.167.61.57	10.167.61.57
30	10.167.61.58/31	10.167.61.58 – 10.167.61.59	10.167.61.59
31	10.167.61.60/31	10.167.61.60 – 10.167.61.61	10.167.61.61
32	10.167.61.62/31	10.167.61.62 – 10.167.61.63	10.167.61.63
33	10.167.61.64/31	10.167.61.64 – 10.167.61.65	10.167.61.65
34	10.167.61.66/31	10.167.61.66 – 10.167.61.67	10.167.61.67
35	10.167.61.68/31	10.167.61.68 – 10.167.61.69	10.167.61.69
36	10.167.61.70/31	10.167.61.70 – 10.167.61.71	10.167.61.71
37	10.167.61.72/31	10.167.61.72 – 10.167.61.73	10.167.61.73
38	10.167.61.74/31	10.167.61.74 – 10.167.61.75	10.167.61.75
39	10.167.61.76/31	10.167.61.76 – 10.167.61.77	10.167.61.77
40	10.167.61.78/31	10.167.61.78 – 10.167.61.79	10.167.61.79
41	10.167.61.80/31	10.167.61.80 – 10.167.61.81	10.167.61.81
42	10.167.61.82/31	10.167.61.82 – 10.167.61.83	10.167.61.83
43	10.167.61.84/31	10.167.61.84 – 10.167.61.85	10.167.61.85
44	10.167.61.86/31	10.167.61.86 – 10.167.61.87	10.167.61.87
45	10.167.61.88/31	10.167.61.88 – 10.167.61.89	10.167.61.89
46	10.167.61.90/31	10.167.61.90 – 10.167.61.91	10.167.61.91
47	10.167.61.92/31	10.167.61.92 – 10.167.61.93	10.167.61.93
48	10.167.61.94/31	10.167.61.94 – 10.167.61.95	10.167.61.95
49	10.167.61.96/31	10.167.61.96 – 10.167.61.97	10.167.61.97
50	10.167.61.98/31	10.167.61.98 – 10.167.61.99	10.167.61.99
51	10.167.61.100/31	10.167.61.100 – 10.167.61.101	10.167.61.101
52	10.167.61.102/31	10.167.61.102 – 10.167.61.103	10.167.61.103
53	10.167.61.104/31	10.167.61.104 – 10.167.61.105	10.167.61.105
54	10.167.61.106/31	10.167.61.106 – 10.167.61.107	10.167.61.107
55	10.167.61.108/31	10.167.61.108 – 10.167.61.109	10.167.61.109
56	10.167.61.110/31	10.167.61.110 – 10.167.61.111	10.167.61.111
57	10.167.61.112/31	10.167.61.112 – 10.167.61.113	10.167.61.113
58	10.167.61.114/31	10.167.61.114 – 10.167.61.115	10.167.61.115
59	10.167.61.116/31	10.167.61.116 – 10.167.61.117	10.167.61.117
60	10.167.61.118/31	10.167.61.118 – 10.167.61.119	10.167.61.119
61	10.167.61.120/31	10.167.61.120 – 10.167.61.121	10.167.61.121
62	10.167.61.122/31	10.167.61.122 – 10.167.61.123	10.167.61.123
63	10.167.61.124/31	10.167.61.124 – 10.167.61.125	10.167.61.125
64	10.167.61.126/31	10.167.61.126 – 10.167.61.127	10.167.61.127

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 →