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)10.59.192.0/18

network10.59.192.0/18

broadcast10.59.255.255

first host10.59.192.1

last host10.59.255.254

subnet mask255.255.192.0

wildcard0.0.63.255

addresses16,384

usable hosts16,382

classA

ipcalc 10.59.192.0/18

address00001010.00111011.11000000.00000000

subnet mask11111111.11111111.11000000.00000000

network00001010.00111011.11000000.00000000

broadcast00001010.00111011.11111111.11111111

green = network part, grey = host part

hex0x0a3bc000

decimal171687936

reverse dns0.192.59.10.in-addr.arpa

ipv4-mapped::ffff:a3b:c000

/18 split into /25 · 128 subnets

close ×

#	network	host range	broadcast
1	10.59.192.0/25	10.59.192.1 – 10.59.192.126	10.59.192.127
2	10.59.192.128/25	10.59.192.129 – 10.59.192.254	10.59.192.255
3	10.59.193.0/25	10.59.193.1 – 10.59.193.126	10.59.193.127
4	10.59.193.128/25	10.59.193.129 – 10.59.193.254	10.59.193.255
5	10.59.194.0/25	10.59.194.1 – 10.59.194.126	10.59.194.127
6	10.59.194.128/25	10.59.194.129 – 10.59.194.254	10.59.194.255
7	10.59.195.0/25	10.59.195.1 – 10.59.195.126	10.59.195.127
8	10.59.195.128/25	10.59.195.129 – 10.59.195.254	10.59.195.255
9	10.59.196.0/25	10.59.196.1 – 10.59.196.126	10.59.196.127
10	10.59.196.128/25	10.59.196.129 – 10.59.196.254	10.59.196.255
11	10.59.197.0/25	10.59.197.1 – 10.59.197.126	10.59.197.127
12	10.59.197.128/25	10.59.197.129 – 10.59.197.254	10.59.197.255
13	10.59.198.0/25	10.59.198.1 – 10.59.198.126	10.59.198.127
14	10.59.198.128/25	10.59.198.129 – 10.59.198.254	10.59.198.255
15	10.59.199.0/25	10.59.199.1 – 10.59.199.126	10.59.199.127
16	10.59.199.128/25	10.59.199.129 – 10.59.199.254	10.59.199.255
17	10.59.200.0/25	10.59.200.1 – 10.59.200.126	10.59.200.127
18	10.59.200.128/25	10.59.200.129 – 10.59.200.254	10.59.200.255
19	10.59.201.0/25	10.59.201.1 – 10.59.201.126	10.59.201.127
20	10.59.201.128/25	10.59.201.129 – 10.59.201.254	10.59.201.255
21	10.59.202.0/25	10.59.202.1 – 10.59.202.126	10.59.202.127
22	10.59.202.128/25	10.59.202.129 – 10.59.202.254	10.59.202.255
23	10.59.203.0/25	10.59.203.1 – 10.59.203.126	10.59.203.127
24	10.59.203.128/25	10.59.203.129 – 10.59.203.254	10.59.203.255
25	10.59.204.0/25	10.59.204.1 – 10.59.204.126	10.59.204.127
26	10.59.204.128/25	10.59.204.129 – 10.59.204.254	10.59.204.255
27	10.59.205.0/25	10.59.205.1 – 10.59.205.126	10.59.205.127
28	10.59.205.128/25	10.59.205.129 – 10.59.205.254	10.59.205.255
29	10.59.206.0/25	10.59.206.1 – 10.59.206.126	10.59.206.127
30	10.59.206.128/25	10.59.206.129 – 10.59.206.254	10.59.206.255
31	10.59.207.0/25	10.59.207.1 – 10.59.207.126	10.59.207.127
32	10.59.207.128/25	10.59.207.129 – 10.59.207.254	10.59.207.255
33	10.59.208.0/25	10.59.208.1 – 10.59.208.126	10.59.208.127
34	10.59.208.128/25	10.59.208.129 – 10.59.208.254	10.59.208.255
35	10.59.209.0/25	10.59.209.1 – 10.59.209.126	10.59.209.127
36	10.59.209.128/25	10.59.209.129 – 10.59.209.254	10.59.209.255
37	10.59.210.0/25	10.59.210.1 – 10.59.210.126	10.59.210.127
38	10.59.210.128/25	10.59.210.129 – 10.59.210.254	10.59.210.255
39	10.59.211.0/25	10.59.211.1 – 10.59.211.126	10.59.211.127
40	10.59.211.128/25	10.59.211.129 – 10.59.211.254	10.59.211.255
41	10.59.212.0/25	10.59.212.1 – 10.59.212.126	10.59.212.127
42	10.59.212.128/25	10.59.212.129 – 10.59.212.254	10.59.212.255
43	10.59.213.0/25	10.59.213.1 – 10.59.213.126	10.59.213.127
44	10.59.213.128/25	10.59.213.129 – 10.59.213.254	10.59.213.255
45	10.59.214.0/25	10.59.214.1 – 10.59.214.126	10.59.214.127
46	10.59.214.128/25	10.59.214.129 – 10.59.214.254	10.59.214.255
47	10.59.215.0/25	10.59.215.1 – 10.59.215.126	10.59.215.127
48	10.59.215.128/25	10.59.215.129 – 10.59.215.254	10.59.215.255
49	10.59.216.0/25	10.59.216.1 – 10.59.216.126	10.59.216.127
50	10.59.216.128/25	10.59.216.129 – 10.59.216.254	10.59.216.255
51	10.59.217.0/25	10.59.217.1 – 10.59.217.126	10.59.217.127
52	10.59.217.128/25	10.59.217.129 – 10.59.217.254	10.59.217.255
53	10.59.218.0/25	10.59.218.1 – 10.59.218.126	10.59.218.127
54	10.59.218.128/25	10.59.218.129 – 10.59.218.254	10.59.218.255
55	10.59.219.0/25	10.59.219.1 – 10.59.219.126	10.59.219.127
56	10.59.219.128/25	10.59.219.129 – 10.59.219.254	10.59.219.255
57	10.59.220.0/25	10.59.220.1 – 10.59.220.126	10.59.220.127
58	10.59.220.128/25	10.59.220.129 – 10.59.220.254	10.59.220.255
59	10.59.221.0/25	10.59.221.1 – 10.59.221.126	10.59.221.127
60	10.59.221.128/25	10.59.221.129 – 10.59.221.254	10.59.221.255
61	10.59.222.0/25	10.59.222.1 – 10.59.222.126	10.59.222.127
62	10.59.222.128/25	10.59.222.129 – 10.59.222.254	10.59.222.255
63	10.59.223.0/25	10.59.223.1 – 10.59.223.126	10.59.223.127
64	10.59.223.128/25	10.59.223.129 – 10.59.223.254	10.59.223.255
65	10.59.224.0/25	10.59.224.1 – 10.59.224.126	10.59.224.127
66	10.59.224.128/25	10.59.224.129 – 10.59.224.254	10.59.224.255
67	10.59.225.0/25	10.59.225.1 – 10.59.225.126	10.59.225.127
68	10.59.225.128/25	10.59.225.129 – 10.59.225.254	10.59.225.255
69	10.59.226.0/25	10.59.226.1 – 10.59.226.126	10.59.226.127
70	10.59.226.128/25	10.59.226.129 – 10.59.226.254	10.59.226.255
71	10.59.227.0/25	10.59.227.1 – 10.59.227.126	10.59.227.127
72	10.59.227.128/25	10.59.227.129 – 10.59.227.254	10.59.227.255
73	10.59.228.0/25	10.59.228.1 – 10.59.228.126	10.59.228.127
74	10.59.228.128/25	10.59.228.129 – 10.59.228.254	10.59.228.255
75	10.59.229.0/25	10.59.229.1 – 10.59.229.126	10.59.229.127
76	10.59.229.128/25	10.59.229.129 – 10.59.229.254	10.59.229.255
77	10.59.230.0/25	10.59.230.1 – 10.59.230.126	10.59.230.127
78	10.59.230.128/25	10.59.230.129 – 10.59.230.254	10.59.230.255
79	10.59.231.0/25	10.59.231.1 – 10.59.231.126	10.59.231.127
80	10.59.231.128/25	10.59.231.129 – 10.59.231.254	10.59.231.255
81	10.59.232.0/25	10.59.232.1 – 10.59.232.126	10.59.232.127
82	10.59.232.128/25	10.59.232.129 – 10.59.232.254	10.59.232.255
83	10.59.233.0/25	10.59.233.1 – 10.59.233.126	10.59.233.127
84	10.59.233.128/25	10.59.233.129 – 10.59.233.254	10.59.233.255
85	10.59.234.0/25	10.59.234.1 – 10.59.234.126	10.59.234.127
86	10.59.234.128/25	10.59.234.129 – 10.59.234.254	10.59.234.255
87	10.59.235.0/25	10.59.235.1 – 10.59.235.126	10.59.235.127
88	10.59.235.128/25	10.59.235.129 – 10.59.235.254	10.59.235.255
89	10.59.236.0/25	10.59.236.1 – 10.59.236.126	10.59.236.127
90	10.59.236.128/25	10.59.236.129 – 10.59.236.254	10.59.236.255
91	10.59.237.0/25	10.59.237.1 – 10.59.237.126	10.59.237.127
92	10.59.237.128/25	10.59.237.129 – 10.59.237.254	10.59.237.255
93	10.59.238.0/25	10.59.238.1 – 10.59.238.126	10.59.238.127
94	10.59.238.128/25	10.59.238.129 – 10.59.238.254	10.59.238.255
95	10.59.239.0/25	10.59.239.1 – 10.59.239.126	10.59.239.127
96	10.59.239.128/25	10.59.239.129 – 10.59.239.254	10.59.239.255
97	10.59.240.0/25	10.59.240.1 – 10.59.240.126	10.59.240.127
98	10.59.240.128/25	10.59.240.129 – 10.59.240.254	10.59.240.255
99	10.59.241.0/25	10.59.241.1 – 10.59.241.126	10.59.241.127
100	10.59.241.128/25	10.59.241.129 – 10.59.241.254	10.59.241.255
101	10.59.242.0/25	10.59.242.1 – 10.59.242.126	10.59.242.127
102	10.59.242.128/25	10.59.242.129 – 10.59.242.254	10.59.242.255
103	10.59.243.0/25	10.59.243.1 – 10.59.243.126	10.59.243.127
104	10.59.243.128/25	10.59.243.129 – 10.59.243.254	10.59.243.255
105	10.59.244.0/25	10.59.244.1 – 10.59.244.126	10.59.244.127
106	10.59.244.128/25	10.59.244.129 – 10.59.244.254	10.59.244.255
107	10.59.245.0/25	10.59.245.1 – 10.59.245.126	10.59.245.127
108	10.59.245.128/25	10.59.245.129 – 10.59.245.254	10.59.245.255
109	10.59.246.0/25	10.59.246.1 – 10.59.246.126	10.59.246.127
110	10.59.246.128/25	10.59.246.129 – 10.59.246.254	10.59.246.255
111	10.59.247.0/25	10.59.247.1 – 10.59.247.126	10.59.247.127
112	10.59.247.128/25	10.59.247.129 – 10.59.247.254	10.59.247.255
113	10.59.248.0/25	10.59.248.1 – 10.59.248.126	10.59.248.127
114	10.59.248.128/25	10.59.248.129 – 10.59.248.254	10.59.248.255
115	10.59.249.0/25	10.59.249.1 – 10.59.249.126	10.59.249.127
116	10.59.249.128/25	10.59.249.129 – 10.59.249.254	10.59.249.255
117	10.59.250.0/25	10.59.250.1 – 10.59.250.126	10.59.250.127
118	10.59.250.128/25	10.59.250.129 – 10.59.250.254	10.59.250.255
119	10.59.251.0/25	10.59.251.1 – 10.59.251.126	10.59.251.127
120	10.59.251.128/25	10.59.251.129 – 10.59.251.254	10.59.251.255
121	10.59.252.0/25	10.59.252.1 – 10.59.252.126	10.59.252.127
122	10.59.252.128/25	10.59.252.129 – 10.59.252.254	10.59.252.255
123	10.59.253.0/25	10.59.253.1 – 10.59.253.126	10.59.253.127
124	10.59.253.128/25	10.59.253.129 – 10.59.253.254	10.59.253.255
125	10.59.254.0/25	10.59.254.1 – 10.59.254.126	10.59.254.127
126	10.59.254.128/25	10.59.254.129 – 10.59.254.254	10.59.254.255
127	10.59.255.0/25	10.59.255.1 – 10.59.255.126	10.59.255.127
128	10.59.255.128/25	10.59.255.129 – 10.59.255.254	10.59.255.255

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 /18
/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	1
/19	255.255.224.0	8,192	8,190	2 split →
/20	255.255.240.0	4,096	4,094	4 split →
/21	255.255.248.0	2,048	2,046	8 split →
/22	255.255.252.0	1,024	1,022	16 split →
/23	255.255.254.0	512	510	32 split →
/24	255.255.255.0	256	254	64 split →
/25	255.255.255.128	128	126	128 split →
/26	255.255.255.192	64	62	256 split →
/27	255.255.255.224	32	30	512 split →
/28	255.255.255.240	16	14	1,024 split →
/29	255.255.255.248	8	6	2,048 split →
/30	255.255.255.252	4	2	4,096 split →
/31	255.255.255.254	2	2	8,192 split →
/32	255.255.255.255	1	1	16,384 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 →