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)10.2.220.0/23

network10.2.220.0/23

broadcast10.2.221.255

first host10.2.220.1

last host10.2.221.254

subnet mask255.255.254.0

wildcard0.0.1.255

addresses512

usable hosts510

classA

ipcalc 10.2.220.0/23

address00001010.00000010.11011100.00000000

subnet mask11111111.11111111.11111110.00000000

network00001010.00000010.11011100.00000000

broadcast00001010.00000010.11011101.11111111

green = network part, grey = host part

hex0x0a02dc00

decimal167959552

reverse dns0.220.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:dc00

/23 split into /30 · 128 subnets

close ×

#	network	host range	broadcast
1	10.2.220.0/30	10.2.220.1 – 10.2.220.2	10.2.220.3
2	10.2.220.4/30	10.2.220.5 – 10.2.220.6	10.2.220.7
3	10.2.220.8/30	10.2.220.9 – 10.2.220.10	10.2.220.11
4	10.2.220.12/30	10.2.220.13 – 10.2.220.14	10.2.220.15
5	10.2.220.16/30	10.2.220.17 – 10.2.220.18	10.2.220.19
6	10.2.220.20/30	10.2.220.21 – 10.2.220.22	10.2.220.23
7	10.2.220.24/30	10.2.220.25 – 10.2.220.26	10.2.220.27
8	10.2.220.28/30	10.2.220.29 – 10.2.220.30	10.2.220.31
9	10.2.220.32/30	10.2.220.33 – 10.2.220.34	10.2.220.35
10	10.2.220.36/30	10.2.220.37 – 10.2.220.38	10.2.220.39
11	10.2.220.40/30	10.2.220.41 – 10.2.220.42	10.2.220.43
12	10.2.220.44/30	10.2.220.45 – 10.2.220.46	10.2.220.47
13	10.2.220.48/30	10.2.220.49 – 10.2.220.50	10.2.220.51
14	10.2.220.52/30	10.2.220.53 – 10.2.220.54	10.2.220.55
15	10.2.220.56/30	10.2.220.57 – 10.2.220.58	10.2.220.59
16	10.2.220.60/30	10.2.220.61 – 10.2.220.62	10.2.220.63
17	10.2.220.64/30	10.2.220.65 – 10.2.220.66	10.2.220.67
18	10.2.220.68/30	10.2.220.69 – 10.2.220.70	10.2.220.71
19	10.2.220.72/30	10.2.220.73 – 10.2.220.74	10.2.220.75
20	10.2.220.76/30	10.2.220.77 – 10.2.220.78	10.2.220.79
21	10.2.220.80/30	10.2.220.81 – 10.2.220.82	10.2.220.83
22	10.2.220.84/30	10.2.220.85 – 10.2.220.86	10.2.220.87
23	10.2.220.88/30	10.2.220.89 – 10.2.220.90	10.2.220.91
24	10.2.220.92/30	10.2.220.93 – 10.2.220.94	10.2.220.95
25	10.2.220.96/30	10.2.220.97 – 10.2.220.98	10.2.220.99
26	10.2.220.100/30	10.2.220.101 – 10.2.220.102	10.2.220.103
27	10.2.220.104/30	10.2.220.105 – 10.2.220.106	10.2.220.107
28	10.2.220.108/30	10.2.220.109 – 10.2.220.110	10.2.220.111
29	10.2.220.112/30	10.2.220.113 – 10.2.220.114	10.2.220.115
30	10.2.220.116/30	10.2.220.117 – 10.2.220.118	10.2.220.119
31	10.2.220.120/30	10.2.220.121 – 10.2.220.122	10.2.220.123
32	10.2.220.124/30	10.2.220.125 – 10.2.220.126	10.2.220.127
33	10.2.220.128/30	10.2.220.129 – 10.2.220.130	10.2.220.131
34	10.2.220.132/30	10.2.220.133 – 10.2.220.134	10.2.220.135
35	10.2.220.136/30	10.2.220.137 – 10.2.220.138	10.2.220.139
36	10.2.220.140/30	10.2.220.141 – 10.2.220.142	10.2.220.143
37	10.2.220.144/30	10.2.220.145 – 10.2.220.146	10.2.220.147
38	10.2.220.148/30	10.2.220.149 – 10.2.220.150	10.2.220.151
39	10.2.220.152/30	10.2.220.153 – 10.2.220.154	10.2.220.155
40	10.2.220.156/30	10.2.220.157 – 10.2.220.158	10.2.220.159
41	10.2.220.160/30	10.2.220.161 – 10.2.220.162	10.2.220.163
42	10.2.220.164/30	10.2.220.165 – 10.2.220.166	10.2.220.167
43	10.2.220.168/30	10.2.220.169 – 10.2.220.170	10.2.220.171
44	10.2.220.172/30	10.2.220.173 – 10.2.220.174	10.2.220.175
45	10.2.220.176/30	10.2.220.177 – 10.2.220.178	10.2.220.179
46	10.2.220.180/30	10.2.220.181 – 10.2.220.182	10.2.220.183
47	10.2.220.184/30	10.2.220.185 – 10.2.220.186	10.2.220.187
48	10.2.220.188/30	10.2.220.189 – 10.2.220.190	10.2.220.191
49	10.2.220.192/30	10.2.220.193 – 10.2.220.194	10.2.220.195
50	10.2.220.196/30	10.2.220.197 – 10.2.220.198	10.2.220.199
51	10.2.220.200/30	10.2.220.201 – 10.2.220.202	10.2.220.203
52	10.2.220.204/30	10.2.220.205 – 10.2.220.206	10.2.220.207
53	10.2.220.208/30	10.2.220.209 – 10.2.220.210	10.2.220.211
54	10.2.220.212/30	10.2.220.213 – 10.2.220.214	10.2.220.215
55	10.2.220.216/30	10.2.220.217 – 10.2.220.218	10.2.220.219
56	10.2.220.220/30	10.2.220.221 – 10.2.220.222	10.2.220.223
57	10.2.220.224/30	10.2.220.225 – 10.2.220.226	10.2.220.227
58	10.2.220.228/30	10.2.220.229 – 10.2.220.230	10.2.220.231
59	10.2.220.232/30	10.2.220.233 – 10.2.220.234	10.2.220.235
60	10.2.220.236/30	10.2.220.237 – 10.2.220.238	10.2.220.239
61	10.2.220.240/30	10.2.220.241 – 10.2.220.242	10.2.220.243
62	10.2.220.244/30	10.2.220.245 – 10.2.220.246	10.2.220.247
63	10.2.220.248/30	10.2.220.249 – 10.2.220.250	10.2.220.251
64	10.2.220.252/30	10.2.220.253 – 10.2.220.254	10.2.220.255
65	10.2.221.0/30	10.2.221.1 – 10.2.221.2	10.2.221.3
66	10.2.221.4/30	10.2.221.5 – 10.2.221.6	10.2.221.7
67	10.2.221.8/30	10.2.221.9 – 10.2.221.10	10.2.221.11
68	10.2.221.12/30	10.2.221.13 – 10.2.221.14	10.2.221.15
69	10.2.221.16/30	10.2.221.17 – 10.2.221.18	10.2.221.19
70	10.2.221.20/30	10.2.221.21 – 10.2.221.22	10.2.221.23
71	10.2.221.24/30	10.2.221.25 – 10.2.221.26	10.2.221.27
72	10.2.221.28/30	10.2.221.29 – 10.2.221.30	10.2.221.31
73	10.2.221.32/30	10.2.221.33 – 10.2.221.34	10.2.221.35
74	10.2.221.36/30	10.2.221.37 – 10.2.221.38	10.2.221.39
75	10.2.221.40/30	10.2.221.41 – 10.2.221.42	10.2.221.43
76	10.2.221.44/30	10.2.221.45 – 10.2.221.46	10.2.221.47
77	10.2.221.48/30	10.2.221.49 – 10.2.221.50	10.2.221.51
78	10.2.221.52/30	10.2.221.53 – 10.2.221.54	10.2.221.55
79	10.2.221.56/30	10.2.221.57 – 10.2.221.58	10.2.221.59
80	10.2.221.60/30	10.2.221.61 – 10.2.221.62	10.2.221.63
81	10.2.221.64/30	10.2.221.65 – 10.2.221.66	10.2.221.67
82	10.2.221.68/30	10.2.221.69 – 10.2.221.70	10.2.221.71
83	10.2.221.72/30	10.2.221.73 – 10.2.221.74	10.2.221.75
84	10.2.221.76/30	10.2.221.77 – 10.2.221.78	10.2.221.79
85	10.2.221.80/30	10.2.221.81 – 10.2.221.82	10.2.221.83
86	10.2.221.84/30	10.2.221.85 – 10.2.221.86	10.2.221.87
87	10.2.221.88/30	10.2.221.89 – 10.2.221.90	10.2.221.91
88	10.2.221.92/30	10.2.221.93 – 10.2.221.94	10.2.221.95
89	10.2.221.96/30	10.2.221.97 – 10.2.221.98	10.2.221.99
90	10.2.221.100/30	10.2.221.101 – 10.2.221.102	10.2.221.103
91	10.2.221.104/30	10.2.221.105 – 10.2.221.106	10.2.221.107
92	10.2.221.108/30	10.2.221.109 – 10.2.221.110	10.2.221.111
93	10.2.221.112/30	10.2.221.113 – 10.2.221.114	10.2.221.115
94	10.2.221.116/30	10.2.221.117 – 10.2.221.118	10.2.221.119
95	10.2.221.120/30	10.2.221.121 – 10.2.221.122	10.2.221.123
96	10.2.221.124/30	10.2.221.125 – 10.2.221.126	10.2.221.127
97	10.2.221.128/30	10.2.221.129 – 10.2.221.130	10.2.221.131
98	10.2.221.132/30	10.2.221.133 – 10.2.221.134	10.2.221.135
99	10.2.221.136/30	10.2.221.137 – 10.2.221.138	10.2.221.139
100	10.2.221.140/30	10.2.221.141 – 10.2.221.142	10.2.221.143
101	10.2.221.144/30	10.2.221.145 – 10.2.221.146	10.2.221.147
102	10.2.221.148/30	10.2.221.149 – 10.2.221.150	10.2.221.151
103	10.2.221.152/30	10.2.221.153 – 10.2.221.154	10.2.221.155
104	10.2.221.156/30	10.2.221.157 – 10.2.221.158	10.2.221.159
105	10.2.221.160/30	10.2.221.161 – 10.2.221.162	10.2.221.163
106	10.2.221.164/30	10.2.221.165 – 10.2.221.166	10.2.221.167
107	10.2.221.168/30	10.2.221.169 – 10.2.221.170	10.2.221.171
108	10.2.221.172/30	10.2.221.173 – 10.2.221.174	10.2.221.175
109	10.2.221.176/30	10.2.221.177 – 10.2.221.178	10.2.221.179
110	10.2.221.180/30	10.2.221.181 – 10.2.221.182	10.2.221.183
111	10.2.221.184/30	10.2.221.185 – 10.2.221.186	10.2.221.187
112	10.2.221.188/30	10.2.221.189 – 10.2.221.190	10.2.221.191
113	10.2.221.192/30	10.2.221.193 – 10.2.221.194	10.2.221.195
114	10.2.221.196/30	10.2.221.197 – 10.2.221.198	10.2.221.199
115	10.2.221.200/30	10.2.221.201 – 10.2.221.202	10.2.221.203
116	10.2.221.204/30	10.2.221.205 – 10.2.221.206	10.2.221.207
117	10.2.221.208/30	10.2.221.209 – 10.2.221.210	10.2.221.211
118	10.2.221.212/30	10.2.221.213 – 10.2.221.214	10.2.221.215
119	10.2.221.216/30	10.2.221.217 – 10.2.221.218	10.2.221.219
120	10.2.221.220/30	10.2.221.221 – 10.2.221.222	10.2.221.223
121	10.2.221.224/30	10.2.221.225 – 10.2.221.226	10.2.221.227
122	10.2.221.228/30	10.2.221.229 – 10.2.221.230	10.2.221.231
123	10.2.221.232/30	10.2.221.233 – 10.2.221.234	10.2.221.235
124	10.2.221.236/30	10.2.221.237 – 10.2.221.238	10.2.221.239
125	10.2.221.240/30	10.2.221.241 – 10.2.221.242	10.2.221.243
126	10.2.221.244/30	10.2.221.245 – 10.2.221.246	10.2.221.247
127	10.2.221.248/30	10.2.221.249 – 10.2.221.250	10.2.221.251
128	10.2.221.252/30	10.2.221.253 – 10.2.221.254	10.2.221.255

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 /23
/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	1
/24	255.255.255.0	256	254	2 split →
/25	255.255.255.128	128	126	4 split →
/26	255.255.255.192	64	62	8 split →
/27	255.255.255.224	32	30	16 split →
/28	255.255.255.240	16	14	32 split →
/29	255.255.255.248	8	6	64 split →
/30	255.255.255.252	4	2	128 split →
/31	255.255.255.254	2	2	256 split →
/32	255.255.255.255	1	1	512 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 →