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)10.221.76.0/23

network10.221.76.0/23

broadcast10.221.77.255

first host10.221.76.1

last host10.221.77.254

subnet mask255.255.254.0

wildcard0.0.1.255

addresses512

usable hosts510

classA

ipcalc 10.221.76.0/23

address00001010.11011101.01001100.00000000

subnet mask11111111.11111111.11111110.00000000

network00001010.11011101.01001100.00000000

broadcast00001010.11011101.01001101.11111111

green = network part, grey = host part

hex0x0add4c00

decimal182275072

reverse dns0.76.221.10.in-addr.arpa

ipv4-mapped::ffff:add:4c00

/23 split into /30 · 128 subnets

close ×

#	network	host range	broadcast
1	10.221.76.0/30	10.221.76.1 – 10.221.76.2	10.221.76.3
2	10.221.76.4/30	10.221.76.5 – 10.221.76.6	10.221.76.7
3	10.221.76.8/30	10.221.76.9 – 10.221.76.10	10.221.76.11
4	10.221.76.12/30	10.221.76.13 – 10.221.76.14	10.221.76.15
5	10.221.76.16/30	10.221.76.17 – 10.221.76.18	10.221.76.19
6	10.221.76.20/30	10.221.76.21 – 10.221.76.22	10.221.76.23
7	10.221.76.24/30	10.221.76.25 – 10.221.76.26	10.221.76.27
8	10.221.76.28/30	10.221.76.29 – 10.221.76.30	10.221.76.31
9	10.221.76.32/30	10.221.76.33 – 10.221.76.34	10.221.76.35
10	10.221.76.36/30	10.221.76.37 – 10.221.76.38	10.221.76.39
11	10.221.76.40/30	10.221.76.41 – 10.221.76.42	10.221.76.43
12	10.221.76.44/30	10.221.76.45 – 10.221.76.46	10.221.76.47
13	10.221.76.48/30	10.221.76.49 – 10.221.76.50	10.221.76.51
14	10.221.76.52/30	10.221.76.53 – 10.221.76.54	10.221.76.55
15	10.221.76.56/30	10.221.76.57 – 10.221.76.58	10.221.76.59
16	10.221.76.60/30	10.221.76.61 – 10.221.76.62	10.221.76.63
17	10.221.76.64/30	10.221.76.65 – 10.221.76.66	10.221.76.67
18	10.221.76.68/30	10.221.76.69 – 10.221.76.70	10.221.76.71
19	10.221.76.72/30	10.221.76.73 – 10.221.76.74	10.221.76.75
20	10.221.76.76/30	10.221.76.77 – 10.221.76.78	10.221.76.79
21	10.221.76.80/30	10.221.76.81 – 10.221.76.82	10.221.76.83
22	10.221.76.84/30	10.221.76.85 – 10.221.76.86	10.221.76.87
23	10.221.76.88/30	10.221.76.89 – 10.221.76.90	10.221.76.91
24	10.221.76.92/30	10.221.76.93 – 10.221.76.94	10.221.76.95
25	10.221.76.96/30	10.221.76.97 – 10.221.76.98	10.221.76.99
26	10.221.76.100/30	10.221.76.101 – 10.221.76.102	10.221.76.103
27	10.221.76.104/30	10.221.76.105 – 10.221.76.106	10.221.76.107
28	10.221.76.108/30	10.221.76.109 – 10.221.76.110	10.221.76.111
29	10.221.76.112/30	10.221.76.113 – 10.221.76.114	10.221.76.115
30	10.221.76.116/30	10.221.76.117 – 10.221.76.118	10.221.76.119
31	10.221.76.120/30	10.221.76.121 – 10.221.76.122	10.221.76.123
32	10.221.76.124/30	10.221.76.125 – 10.221.76.126	10.221.76.127
33	10.221.76.128/30	10.221.76.129 – 10.221.76.130	10.221.76.131
34	10.221.76.132/30	10.221.76.133 – 10.221.76.134	10.221.76.135
35	10.221.76.136/30	10.221.76.137 – 10.221.76.138	10.221.76.139
36	10.221.76.140/30	10.221.76.141 – 10.221.76.142	10.221.76.143
37	10.221.76.144/30	10.221.76.145 – 10.221.76.146	10.221.76.147
38	10.221.76.148/30	10.221.76.149 – 10.221.76.150	10.221.76.151
39	10.221.76.152/30	10.221.76.153 – 10.221.76.154	10.221.76.155
40	10.221.76.156/30	10.221.76.157 – 10.221.76.158	10.221.76.159
41	10.221.76.160/30	10.221.76.161 – 10.221.76.162	10.221.76.163
42	10.221.76.164/30	10.221.76.165 – 10.221.76.166	10.221.76.167
43	10.221.76.168/30	10.221.76.169 – 10.221.76.170	10.221.76.171
44	10.221.76.172/30	10.221.76.173 – 10.221.76.174	10.221.76.175
45	10.221.76.176/30	10.221.76.177 – 10.221.76.178	10.221.76.179
46	10.221.76.180/30	10.221.76.181 – 10.221.76.182	10.221.76.183
47	10.221.76.184/30	10.221.76.185 – 10.221.76.186	10.221.76.187
48	10.221.76.188/30	10.221.76.189 – 10.221.76.190	10.221.76.191
49	10.221.76.192/30	10.221.76.193 – 10.221.76.194	10.221.76.195
50	10.221.76.196/30	10.221.76.197 – 10.221.76.198	10.221.76.199
51	10.221.76.200/30	10.221.76.201 – 10.221.76.202	10.221.76.203
52	10.221.76.204/30	10.221.76.205 – 10.221.76.206	10.221.76.207
53	10.221.76.208/30	10.221.76.209 – 10.221.76.210	10.221.76.211
54	10.221.76.212/30	10.221.76.213 – 10.221.76.214	10.221.76.215
55	10.221.76.216/30	10.221.76.217 – 10.221.76.218	10.221.76.219
56	10.221.76.220/30	10.221.76.221 – 10.221.76.222	10.221.76.223
57	10.221.76.224/30	10.221.76.225 – 10.221.76.226	10.221.76.227
58	10.221.76.228/30	10.221.76.229 – 10.221.76.230	10.221.76.231
59	10.221.76.232/30	10.221.76.233 – 10.221.76.234	10.221.76.235
60	10.221.76.236/30	10.221.76.237 – 10.221.76.238	10.221.76.239
61	10.221.76.240/30	10.221.76.241 – 10.221.76.242	10.221.76.243
62	10.221.76.244/30	10.221.76.245 – 10.221.76.246	10.221.76.247
63	10.221.76.248/30	10.221.76.249 – 10.221.76.250	10.221.76.251
64	10.221.76.252/30	10.221.76.253 – 10.221.76.254	10.221.76.255
65	10.221.77.0/30	10.221.77.1 – 10.221.77.2	10.221.77.3
66	10.221.77.4/30	10.221.77.5 – 10.221.77.6	10.221.77.7
67	10.221.77.8/30	10.221.77.9 – 10.221.77.10	10.221.77.11
68	10.221.77.12/30	10.221.77.13 – 10.221.77.14	10.221.77.15
69	10.221.77.16/30	10.221.77.17 – 10.221.77.18	10.221.77.19
70	10.221.77.20/30	10.221.77.21 – 10.221.77.22	10.221.77.23
71	10.221.77.24/30	10.221.77.25 – 10.221.77.26	10.221.77.27
72	10.221.77.28/30	10.221.77.29 – 10.221.77.30	10.221.77.31
73	10.221.77.32/30	10.221.77.33 – 10.221.77.34	10.221.77.35
74	10.221.77.36/30	10.221.77.37 – 10.221.77.38	10.221.77.39
75	10.221.77.40/30	10.221.77.41 – 10.221.77.42	10.221.77.43
76	10.221.77.44/30	10.221.77.45 – 10.221.77.46	10.221.77.47
77	10.221.77.48/30	10.221.77.49 – 10.221.77.50	10.221.77.51
78	10.221.77.52/30	10.221.77.53 – 10.221.77.54	10.221.77.55
79	10.221.77.56/30	10.221.77.57 – 10.221.77.58	10.221.77.59
80	10.221.77.60/30	10.221.77.61 – 10.221.77.62	10.221.77.63
81	10.221.77.64/30	10.221.77.65 – 10.221.77.66	10.221.77.67
82	10.221.77.68/30	10.221.77.69 – 10.221.77.70	10.221.77.71
83	10.221.77.72/30	10.221.77.73 – 10.221.77.74	10.221.77.75
84	10.221.77.76/30	10.221.77.77 – 10.221.77.78	10.221.77.79
85	10.221.77.80/30	10.221.77.81 – 10.221.77.82	10.221.77.83
86	10.221.77.84/30	10.221.77.85 – 10.221.77.86	10.221.77.87
87	10.221.77.88/30	10.221.77.89 – 10.221.77.90	10.221.77.91
88	10.221.77.92/30	10.221.77.93 – 10.221.77.94	10.221.77.95
89	10.221.77.96/30	10.221.77.97 – 10.221.77.98	10.221.77.99
90	10.221.77.100/30	10.221.77.101 – 10.221.77.102	10.221.77.103
91	10.221.77.104/30	10.221.77.105 – 10.221.77.106	10.221.77.107
92	10.221.77.108/30	10.221.77.109 – 10.221.77.110	10.221.77.111
93	10.221.77.112/30	10.221.77.113 – 10.221.77.114	10.221.77.115
94	10.221.77.116/30	10.221.77.117 – 10.221.77.118	10.221.77.119
95	10.221.77.120/30	10.221.77.121 – 10.221.77.122	10.221.77.123
96	10.221.77.124/30	10.221.77.125 – 10.221.77.126	10.221.77.127
97	10.221.77.128/30	10.221.77.129 – 10.221.77.130	10.221.77.131
98	10.221.77.132/30	10.221.77.133 – 10.221.77.134	10.221.77.135
99	10.221.77.136/30	10.221.77.137 – 10.221.77.138	10.221.77.139
100	10.221.77.140/30	10.221.77.141 – 10.221.77.142	10.221.77.143
101	10.221.77.144/30	10.221.77.145 – 10.221.77.146	10.221.77.147
102	10.221.77.148/30	10.221.77.149 – 10.221.77.150	10.221.77.151
103	10.221.77.152/30	10.221.77.153 – 10.221.77.154	10.221.77.155
104	10.221.77.156/30	10.221.77.157 – 10.221.77.158	10.221.77.159
105	10.221.77.160/30	10.221.77.161 – 10.221.77.162	10.221.77.163
106	10.221.77.164/30	10.221.77.165 – 10.221.77.166	10.221.77.167
107	10.221.77.168/30	10.221.77.169 – 10.221.77.170	10.221.77.171
108	10.221.77.172/30	10.221.77.173 – 10.221.77.174	10.221.77.175
109	10.221.77.176/30	10.221.77.177 – 10.221.77.178	10.221.77.179
110	10.221.77.180/30	10.221.77.181 – 10.221.77.182	10.221.77.183
111	10.221.77.184/30	10.221.77.185 – 10.221.77.186	10.221.77.187
112	10.221.77.188/30	10.221.77.189 – 10.221.77.190	10.221.77.191
113	10.221.77.192/30	10.221.77.193 – 10.221.77.194	10.221.77.195
114	10.221.77.196/30	10.221.77.197 – 10.221.77.198	10.221.77.199
115	10.221.77.200/30	10.221.77.201 – 10.221.77.202	10.221.77.203
116	10.221.77.204/30	10.221.77.205 – 10.221.77.206	10.221.77.207
117	10.221.77.208/30	10.221.77.209 – 10.221.77.210	10.221.77.211
118	10.221.77.212/30	10.221.77.213 – 10.221.77.214	10.221.77.215
119	10.221.77.216/30	10.221.77.217 – 10.221.77.218	10.221.77.219
120	10.221.77.220/30	10.221.77.221 – 10.221.77.222	10.221.77.223
121	10.221.77.224/30	10.221.77.225 – 10.221.77.226	10.221.77.227
122	10.221.77.228/30	10.221.77.229 – 10.221.77.230	10.221.77.231
123	10.221.77.232/30	10.221.77.233 – 10.221.77.234	10.221.77.235
124	10.221.77.236/30	10.221.77.237 – 10.221.77.238	10.221.77.239
125	10.221.77.240/30	10.221.77.241 – 10.221.77.242	10.221.77.243
126	10.221.77.244/30	10.221.77.245 – 10.221.77.246	10.221.77.247
127	10.221.77.248/30	10.221.77.249 – 10.221.77.250	10.221.77.251
128	10.221.77.252/30	10.221.77.253 – 10.221.77.254	10.221.77.255

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 →