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)10.3.70.0/23

network10.3.70.0/23

broadcast10.3.71.255

first host10.3.70.1

last host10.3.71.254

subnet mask255.255.254.0

wildcard0.0.1.255

addresses512

usable hosts510

classA

ipcalc 10.3.70.0/23

address00001010.00000011.01000110.00000000

subnet mask11111111.11111111.11111110.00000000

network00001010.00000011.01000110.00000000

broadcast00001010.00000011.01000111.11111111

green = network part, grey = host part

hex0x0a034600

decimal167986688

reverse dns0.70.3.10.in-addr.arpa

ipv4-mapped::ffff:a03:4600

/23 split into /30 · 128 subnets

close ×

#	network	host range	broadcast
1	10.3.70.0/30	10.3.70.1 – 10.3.70.2	10.3.70.3
2	10.3.70.4/30	10.3.70.5 – 10.3.70.6	10.3.70.7
3	10.3.70.8/30	10.3.70.9 – 10.3.70.10	10.3.70.11
4	10.3.70.12/30	10.3.70.13 – 10.3.70.14	10.3.70.15
5	10.3.70.16/30	10.3.70.17 – 10.3.70.18	10.3.70.19
6	10.3.70.20/30	10.3.70.21 – 10.3.70.22	10.3.70.23
7	10.3.70.24/30	10.3.70.25 – 10.3.70.26	10.3.70.27
8	10.3.70.28/30	10.3.70.29 – 10.3.70.30	10.3.70.31
9	10.3.70.32/30	10.3.70.33 – 10.3.70.34	10.3.70.35
10	10.3.70.36/30	10.3.70.37 – 10.3.70.38	10.3.70.39
11	10.3.70.40/30	10.3.70.41 – 10.3.70.42	10.3.70.43
12	10.3.70.44/30	10.3.70.45 – 10.3.70.46	10.3.70.47
13	10.3.70.48/30	10.3.70.49 – 10.3.70.50	10.3.70.51
14	10.3.70.52/30	10.3.70.53 – 10.3.70.54	10.3.70.55
15	10.3.70.56/30	10.3.70.57 – 10.3.70.58	10.3.70.59
16	10.3.70.60/30	10.3.70.61 – 10.3.70.62	10.3.70.63
17	10.3.70.64/30	10.3.70.65 – 10.3.70.66	10.3.70.67
18	10.3.70.68/30	10.3.70.69 – 10.3.70.70	10.3.70.71
19	10.3.70.72/30	10.3.70.73 – 10.3.70.74	10.3.70.75
20	10.3.70.76/30	10.3.70.77 – 10.3.70.78	10.3.70.79
21	10.3.70.80/30	10.3.70.81 – 10.3.70.82	10.3.70.83
22	10.3.70.84/30	10.3.70.85 – 10.3.70.86	10.3.70.87
23	10.3.70.88/30	10.3.70.89 – 10.3.70.90	10.3.70.91
24	10.3.70.92/30	10.3.70.93 – 10.3.70.94	10.3.70.95
25	10.3.70.96/30	10.3.70.97 – 10.3.70.98	10.3.70.99
26	10.3.70.100/30	10.3.70.101 – 10.3.70.102	10.3.70.103
27	10.3.70.104/30	10.3.70.105 – 10.3.70.106	10.3.70.107
28	10.3.70.108/30	10.3.70.109 – 10.3.70.110	10.3.70.111
29	10.3.70.112/30	10.3.70.113 – 10.3.70.114	10.3.70.115
30	10.3.70.116/30	10.3.70.117 – 10.3.70.118	10.3.70.119
31	10.3.70.120/30	10.3.70.121 – 10.3.70.122	10.3.70.123
32	10.3.70.124/30	10.3.70.125 – 10.3.70.126	10.3.70.127
33	10.3.70.128/30	10.3.70.129 – 10.3.70.130	10.3.70.131
34	10.3.70.132/30	10.3.70.133 – 10.3.70.134	10.3.70.135
35	10.3.70.136/30	10.3.70.137 – 10.3.70.138	10.3.70.139
36	10.3.70.140/30	10.3.70.141 – 10.3.70.142	10.3.70.143
37	10.3.70.144/30	10.3.70.145 – 10.3.70.146	10.3.70.147
38	10.3.70.148/30	10.3.70.149 – 10.3.70.150	10.3.70.151
39	10.3.70.152/30	10.3.70.153 – 10.3.70.154	10.3.70.155
40	10.3.70.156/30	10.3.70.157 – 10.3.70.158	10.3.70.159
41	10.3.70.160/30	10.3.70.161 – 10.3.70.162	10.3.70.163
42	10.3.70.164/30	10.3.70.165 – 10.3.70.166	10.3.70.167
43	10.3.70.168/30	10.3.70.169 – 10.3.70.170	10.3.70.171
44	10.3.70.172/30	10.3.70.173 – 10.3.70.174	10.3.70.175
45	10.3.70.176/30	10.3.70.177 – 10.3.70.178	10.3.70.179
46	10.3.70.180/30	10.3.70.181 – 10.3.70.182	10.3.70.183
47	10.3.70.184/30	10.3.70.185 – 10.3.70.186	10.3.70.187
48	10.3.70.188/30	10.3.70.189 – 10.3.70.190	10.3.70.191
49	10.3.70.192/30	10.3.70.193 – 10.3.70.194	10.3.70.195
50	10.3.70.196/30	10.3.70.197 – 10.3.70.198	10.3.70.199
51	10.3.70.200/30	10.3.70.201 – 10.3.70.202	10.3.70.203
52	10.3.70.204/30	10.3.70.205 – 10.3.70.206	10.3.70.207
53	10.3.70.208/30	10.3.70.209 – 10.3.70.210	10.3.70.211
54	10.3.70.212/30	10.3.70.213 – 10.3.70.214	10.3.70.215
55	10.3.70.216/30	10.3.70.217 – 10.3.70.218	10.3.70.219
56	10.3.70.220/30	10.3.70.221 – 10.3.70.222	10.3.70.223
57	10.3.70.224/30	10.3.70.225 – 10.3.70.226	10.3.70.227
58	10.3.70.228/30	10.3.70.229 – 10.3.70.230	10.3.70.231
59	10.3.70.232/30	10.3.70.233 – 10.3.70.234	10.3.70.235
60	10.3.70.236/30	10.3.70.237 – 10.3.70.238	10.3.70.239
61	10.3.70.240/30	10.3.70.241 – 10.3.70.242	10.3.70.243
62	10.3.70.244/30	10.3.70.245 – 10.3.70.246	10.3.70.247
63	10.3.70.248/30	10.3.70.249 – 10.3.70.250	10.3.70.251
64	10.3.70.252/30	10.3.70.253 – 10.3.70.254	10.3.70.255
65	10.3.71.0/30	10.3.71.1 – 10.3.71.2	10.3.71.3
66	10.3.71.4/30	10.3.71.5 – 10.3.71.6	10.3.71.7
67	10.3.71.8/30	10.3.71.9 – 10.3.71.10	10.3.71.11
68	10.3.71.12/30	10.3.71.13 – 10.3.71.14	10.3.71.15
69	10.3.71.16/30	10.3.71.17 – 10.3.71.18	10.3.71.19
70	10.3.71.20/30	10.3.71.21 – 10.3.71.22	10.3.71.23
71	10.3.71.24/30	10.3.71.25 – 10.3.71.26	10.3.71.27
72	10.3.71.28/30	10.3.71.29 – 10.3.71.30	10.3.71.31
73	10.3.71.32/30	10.3.71.33 – 10.3.71.34	10.3.71.35
74	10.3.71.36/30	10.3.71.37 – 10.3.71.38	10.3.71.39
75	10.3.71.40/30	10.3.71.41 – 10.3.71.42	10.3.71.43
76	10.3.71.44/30	10.3.71.45 – 10.3.71.46	10.3.71.47
77	10.3.71.48/30	10.3.71.49 – 10.3.71.50	10.3.71.51
78	10.3.71.52/30	10.3.71.53 – 10.3.71.54	10.3.71.55
79	10.3.71.56/30	10.3.71.57 – 10.3.71.58	10.3.71.59
80	10.3.71.60/30	10.3.71.61 – 10.3.71.62	10.3.71.63
81	10.3.71.64/30	10.3.71.65 – 10.3.71.66	10.3.71.67
82	10.3.71.68/30	10.3.71.69 – 10.3.71.70	10.3.71.71
83	10.3.71.72/30	10.3.71.73 – 10.3.71.74	10.3.71.75
84	10.3.71.76/30	10.3.71.77 – 10.3.71.78	10.3.71.79
85	10.3.71.80/30	10.3.71.81 – 10.3.71.82	10.3.71.83
86	10.3.71.84/30	10.3.71.85 – 10.3.71.86	10.3.71.87
87	10.3.71.88/30	10.3.71.89 – 10.3.71.90	10.3.71.91
88	10.3.71.92/30	10.3.71.93 – 10.3.71.94	10.3.71.95
89	10.3.71.96/30	10.3.71.97 – 10.3.71.98	10.3.71.99
90	10.3.71.100/30	10.3.71.101 – 10.3.71.102	10.3.71.103
91	10.3.71.104/30	10.3.71.105 – 10.3.71.106	10.3.71.107
92	10.3.71.108/30	10.3.71.109 – 10.3.71.110	10.3.71.111
93	10.3.71.112/30	10.3.71.113 – 10.3.71.114	10.3.71.115
94	10.3.71.116/30	10.3.71.117 – 10.3.71.118	10.3.71.119
95	10.3.71.120/30	10.3.71.121 – 10.3.71.122	10.3.71.123
96	10.3.71.124/30	10.3.71.125 – 10.3.71.126	10.3.71.127
97	10.3.71.128/30	10.3.71.129 – 10.3.71.130	10.3.71.131
98	10.3.71.132/30	10.3.71.133 – 10.3.71.134	10.3.71.135
99	10.3.71.136/30	10.3.71.137 – 10.3.71.138	10.3.71.139
100	10.3.71.140/30	10.3.71.141 – 10.3.71.142	10.3.71.143
101	10.3.71.144/30	10.3.71.145 – 10.3.71.146	10.3.71.147
102	10.3.71.148/30	10.3.71.149 – 10.3.71.150	10.3.71.151
103	10.3.71.152/30	10.3.71.153 – 10.3.71.154	10.3.71.155
104	10.3.71.156/30	10.3.71.157 – 10.3.71.158	10.3.71.159
105	10.3.71.160/30	10.3.71.161 – 10.3.71.162	10.3.71.163
106	10.3.71.164/30	10.3.71.165 – 10.3.71.166	10.3.71.167
107	10.3.71.168/30	10.3.71.169 – 10.3.71.170	10.3.71.171
108	10.3.71.172/30	10.3.71.173 – 10.3.71.174	10.3.71.175
109	10.3.71.176/30	10.3.71.177 – 10.3.71.178	10.3.71.179
110	10.3.71.180/30	10.3.71.181 – 10.3.71.182	10.3.71.183
111	10.3.71.184/30	10.3.71.185 – 10.3.71.186	10.3.71.187
112	10.3.71.188/30	10.3.71.189 – 10.3.71.190	10.3.71.191
113	10.3.71.192/30	10.3.71.193 – 10.3.71.194	10.3.71.195
114	10.3.71.196/30	10.3.71.197 – 10.3.71.198	10.3.71.199
115	10.3.71.200/30	10.3.71.201 – 10.3.71.202	10.3.71.203
116	10.3.71.204/30	10.3.71.205 – 10.3.71.206	10.3.71.207
117	10.3.71.208/30	10.3.71.209 – 10.3.71.210	10.3.71.211
118	10.3.71.212/30	10.3.71.213 – 10.3.71.214	10.3.71.215
119	10.3.71.216/30	10.3.71.217 – 10.3.71.218	10.3.71.219
120	10.3.71.220/30	10.3.71.221 – 10.3.71.222	10.3.71.223
121	10.3.71.224/30	10.3.71.225 – 10.3.71.226	10.3.71.227
122	10.3.71.228/30	10.3.71.229 – 10.3.71.230	10.3.71.231
123	10.3.71.232/30	10.3.71.233 – 10.3.71.234	10.3.71.235
124	10.3.71.236/30	10.3.71.237 – 10.3.71.238	10.3.71.239
125	10.3.71.240/30	10.3.71.241 – 10.3.71.242	10.3.71.243
126	10.3.71.244/30	10.3.71.245 – 10.3.71.246	10.3.71.247
127	10.3.71.248/30	10.3.71.249 – 10.3.71.250	10.3.71.251
128	10.3.71.252/30	10.3.71.253 – 10.3.71.254	10.3.71.255

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 →