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)10.3.210.0/23

network10.3.210.0/23

broadcast10.3.211.255

first host10.3.210.1

last host10.3.211.254

subnet mask255.255.254.0

wildcard0.0.1.255

addresses512

usable hosts510

classA

ipcalc 10.3.210.0/23

address00001010.00000011.11010010.00000000

subnet mask11111111.11111111.11111110.00000000

network00001010.00000011.11010010.00000000

broadcast00001010.00000011.11010011.11111111

green = network part, grey = host part

hex0x0a03d200

decimal168022528

reverse dns0.210.3.10.in-addr.arpa

ipv4-mapped::ffff:a03:d200

/23 split into /30 · 128 subnets

close ×

#	network	host range	broadcast
1	10.3.210.0/30	10.3.210.1 – 10.3.210.2	10.3.210.3
2	10.3.210.4/30	10.3.210.5 – 10.3.210.6	10.3.210.7
3	10.3.210.8/30	10.3.210.9 – 10.3.210.10	10.3.210.11
4	10.3.210.12/30	10.3.210.13 – 10.3.210.14	10.3.210.15
5	10.3.210.16/30	10.3.210.17 – 10.3.210.18	10.3.210.19
6	10.3.210.20/30	10.3.210.21 – 10.3.210.22	10.3.210.23
7	10.3.210.24/30	10.3.210.25 – 10.3.210.26	10.3.210.27
8	10.3.210.28/30	10.3.210.29 – 10.3.210.30	10.3.210.31
9	10.3.210.32/30	10.3.210.33 – 10.3.210.34	10.3.210.35
10	10.3.210.36/30	10.3.210.37 – 10.3.210.38	10.3.210.39
11	10.3.210.40/30	10.3.210.41 – 10.3.210.42	10.3.210.43
12	10.3.210.44/30	10.3.210.45 – 10.3.210.46	10.3.210.47
13	10.3.210.48/30	10.3.210.49 – 10.3.210.50	10.3.210.51
14	10.3.210.52/30	10.3.210.53 – 10.3.210.54	10.3.210.55
15	10.3.210.56/30	10.3.210.57 – 10.3.210.58	10.3.210.59
16	10.3.210.60/30	10.3.210.61 – 10.3.210.62	10.3.210.63
17	10.3.210.64/30	10.3.210.65 – 10.3.210.66	10.3.210.67
18	10.3.210.68/30	10.3.210.69 – 10.3.210.70	10.3.210.71
19	10.3.210.72/30	10.3.210.73 – 10.3.210.74	10.3.210.75
20	10.3.210.76/30	10.3.210.77 – 10.3.210.78	10.3.210.79
21	10.3.210.80/30	10.3.210.81 – 10.3.210.82	10.3.210.83
22	10.3.210.84/30	10.3.210.85 – 10.3.210.86	10.3.210.87
23	10.3.210.88/30	10.3.210.89 – 10.3.210.90	10.3.210.91
24	10.3.210.92/30	10.3.210.93 – 10.3.210.94	10.3.210.95
25	10.3.210.96/30	10.3.210.97 – 10.3.210.98	10.3.210.99
26	10.3.210.100/30	10.3.210.101 – 10.3.210.102	10.3.210.103
27	10.3.210.104/30	10.3.210.105 – 10.3.210.106	10.3.210.107
28	10.3.210.108/30	10.3.210.109 – 10.3.210.110	10.3.210.111
29	10.3.210.112/30	10.3.210.113 – 10.3.210.114	10.3.210.115
30	10.3.210.116/30	10.3.210.117 – 10.3.210.118	10.3.210.119
31	10.3.210.120/30	10.3.210.121 – 10.3.210.122	10.3.210.123
32	10.3.210.124/30	10.3.210.125 – 10.3.210.126	10.3.210.127
33	10.3.210.128/30	10.3.210.129 – 10.3.210.130	10.3.210.131
34	10.3.210.132/30	10.3.210.133 – 10.3.210.134	10.3.210.135
35	10.3.210.136/30	10.3.210.137 – 10.3.210.138	10.3.210.139
36	10.3.210.140/30	10.3.210.141 – 10.3.210.142	10.3.210.143
37	10.3.210.144/30	10.3.210.145 – 10.3.210.146	10.3.210.147
38	10.3.210.148/30	10.3.210.149 – 10.3.210.150	10.3.210.151
39	10.3.210.152/30	10.3.210.153 – 10.3.210.154	10.3.210.155
40	10.3.210.156/30	10.3.210.157 – 10.3.210.158	10.3.210.159
41	10.3.210.160/30	10.3.210.161 – 10.3.210.162	10.3.210.163
42	10.3.210.164/30	10.3.210.165 – 10.3.210.166	10.3.210.167
43	10.3.210.168/30	10.3.210.169 – 10.3.210.170	10.3.210.171
44	10.3.210.172/30	10.3.210.173 – 10.3.210.174	10.3.210.175
45	10.3.210.176/30	10.3.210.177 – 10.3.210.178	10.3.210.179
46	10.3.210.180/30	10.3.210.181 – 10.3.210.182	10.3.210.183
47	10.3.210.184/30	10.3.210.185 – 10.3.210.186	10.3.210.187
48	10.3.210.188/30	10.3.210.189 – 10.3.210.190	10.3.210.191
49	10.3.210.192/30	10.3.210.193 – 10.3.210.194	10.3.210.195
50	10.3.210.196/30	10.3.210.197 – 10.3.210.198	10.3.210.199
51	10.3.210.200/30	10.3.210.201 – 10.3.210.202	10.3.210.203
52	10.3.210.204/30	10.3.210.205 – 10.3.210.206	10.3.210.207
53	10.3.210.208/30	10.3.210.209 – 10.3.210.210	10.3.210.211
54	10.3.210.212/30	10.3.210.213 – 10.3.210.214	10.3.210.215
55	10.3.210.216/30	10.3.210.217 – 10.3.210.218	10.3.210.219
56	10.3.210.220/30	10.3.210.221 – 10.3.210.222	10.3.210.223
57	10.3.210.224/30	10.3.210.225 – 10.3.210.226	10.3.210.227
58	10.3.210.228/30	10.3.210.229 – 10.3.210.230	10.3.210.231
59	10.3.210.232/30	10.3.210.233 – 10.3.210.234	10.3.210.235
60	10.3.210.236/30	10.3.210.237 – 10.3.210.238	10.3.210.239
61	10.3.210.240/30	10.3.210.241 – 10.3.210.242	10.3.210.243
62	10.3.210.244/30	10.3.210.245 – 10.3.210.246	10.3.210.247
63	10.3.210.248/30	10.3.210.249 – 10.3.210.250	10.3.210.251
64	10.3.210.252/30	10.3.210.253 – 10.3.210.254	10.3.210.255
65	10.3.211.0/30	10.3.211.1 – 10.3.211.2	10.3.211.3
66	10.3.211.4/30	10.3.211.5 – 10.3.211.6	10.3.211.7
67	10.3.211.8/30	10.3.211.9 – 10.3.211.10	10.3.211.11
68	10.3.211.12/30	10.3.211.13 – 10.3.211.14	10.3.211.15
69	10.3.211.16/30	10.3.211.17 – 10.3.211.18	10.3.211.19
70	10.3.211.20/30	10.3.211.21 – 10.3.211.22	10.3.211.23
71	10.3.211.24/30	10.3.211.25 – 10.3.211.26	10.3.211.27
72	10.3.211.28/30	10.3.211.29 – 10.3.211.30	10.3.211.31
73	10.3.211.32/30	10.3.211.33 – 10.3.211.34	10.3.211.35
74	10.3.211.36/30	10.3.211.37 – 10.3.211.38	10.3.211.39
75	10.3.211.40/30	10.3.211.41 – 10.3.211.42	10.3.211.43
76	10.3.211.44/30	10.3.211.45 – 10.3.211.46	10.3.211.47
77	10.3.211.48/30	10.3.211.49 – 10.3.211.50	10.3.211.51
78	10.3.211.52/30	10.3.211.53 – 10.3.211.54	10.3.211.55
79	10.3.211.56/30	10.3.211.57 – 10.3.211.58	10.3.211.59
80	10.3.211.60/30	10.3.211.61 – 10.3.211.62	10.3.211.63
81	10.3.211.64/30	10.3.211.65 – 10.3.211.66	10.3.211.67
82	10.3.211.68/30	10.3.211.69 – 10.3.211.70	10.3.211.71
83	10.3.211.72/30	10.3.211.73 – 10.3.211.74	10.3.211.75
84	10.3.211.76/30	10.3.211.77 – 10.3.211.78	10.3.211.79
85	10.3.211.80/30	10.3.211.81 – 10.3.211.82	10.3.211.83
86	10.3.211.84/30	10.3.211.85 – 10.3.211.86	10.3.211.87
87	10.3.211.88/30	10.3.211.89 – 10.3.211.90	10.3.211.91
88	10.3.211.92/30	10.3.211.93 – 10.3.211.94	10.3.211.95
89	10.3.211.96/30	10.3.211.97 – 10.3.211.98	10.3.211.99
90	10.3.211.100/30	10.3.211.101 – 10.3.211.102	10.3.211.103
91	10.3.211.104/30	10.3.211.105 – 10.3.211.106	10.3.211.107
92	10.3.211.108/30	10.3.211.109 – 10.3.211.110	10.3.211.111
93	10.3.211.112/30	10.3.211.113 – 10.3.211.114	10.3.211.115
94	10.3.211.116/30	10.3.211.117 – 10.3.211.118	10.3.211.119
95	10.3.211.120/30	10.3.211.121 – 10.3.211.122	10.3.211.123
96	10.3.211.124/30	10.3.211.125 – 10.3.211.126	10.3.211.127
97	10.3.211.128/30	10.3.211.129 – 10.3.211.130	10.3.211.131
98	10.3.211.132/30	10.3.211.133 – 10.3.211.134	10.3.211.135
99	10.3.211.136/30	10.3.211.137 – 10.3.211.138	10.3.211.139
100	10.3.211.140/30	10.3.211.141 – 10.3.211.142	10.3.211.143
101	10.3.211.144/30	10.3.211.145 – 10.3.211.146	10.3.211.147
102	10.3.211.148/30	10.3.211.149 – 10.3.211.150	10.3.211.151
103	10.3.211.152/30	10.3.211.153 – 10.3.211.154	10.3.211.155
104	10.3.211.156/30	10.3.211.157 – 10.3.211.158	10.3.211.159
105	10.3.211.160/30	10.3.211.161 – 10.3.211.162	10.3.211.163
106	10.3.211.164/30	10.3.211.165 – 10.3.211.166	10.3.211.167
107	10.3.211.168/30	10.3.211.169 – 10.3.211.170	10.3.211.171
108	10.3.211.172/30	10.3.211.173 – 10.3.211.174	10.3.211.175
109	10.3.211.176/30	10.3.211.177 – 10.3.211.178	10.3.211.179
110	10.3.211.180/30	10.3.211.181 – 10.3.211.182	10.3.211.183
111	10.3.211.184/30	10.3.211.185 – 10.3.211.186	10.3.211.187
112	10.3.211.188/30	10.3.211.189 – 10.3.211.190	10.3.211.191
113	10.3.211.192/30	10.3.211.193 – 10.3.211.194	10.3.211.195
114	10.3.211.196/30	10.3.211.197 – 10.3.211.198	10.3.211.199
115	10.3.211.200/30	10.3.211.201 – 10.3.211.202	10.3.211.203
116	10.3.211.204/30	10.3.211.205 – 10.3.211.206	10.3.211.207
117	10.3.211.208/30	10.3.211.209 – 10.3.211.210	10.3.211.211
118	10.3.211.212/30	10.3.211.213 – 10.3.211.214	10.3.211.215
119	10.3.211.216/30	10.3.211.217 – 10.3.211.218	10.3.211.219
120	10.3.211.220/30	10.3.211.221 – 10.3.211.222	10.3.211.223
121	10.3.211.224/30	10.3.211.225 – 10.3.211.226	10.3.211.227
122	10.3.211.228/30	10.3.211.229 – 10.3.211.230	10.3.211.231
123	10.3.211.232/30	10.3.211.233 – 10.3.211.234	10.3.211.235
124	10.3.211.236/30	10.3.211.237 – 10.3.211.238	10.3.211.239
125	10.3.211.240/30	10.3.211.241 – 10.3.211.242	10.3.211.243
126	10.3.211.244/30	10.3.211.245 – 10.3.211.246	10.3.211.247
127	10.3.211.248/30	10.3.211.249 – 10.3.211.250	10.3.211.251
128	10.3.211.252/30	10.3.211.253 – 10.3.211.254	10.3.211.255

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 →