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)10.71.96.0/23

network10.71.96.0/23

broadcast10.71.97.255

first host10.71.96.1

last host10.71.97.254

subnet mask255.255.254.0

wildcard0.0.1.255

addresses512

usable hosts510

classA

ipcalc 10.71.96.0/23

address00001010.01000111.01100000.00000000

subnet mask11111111.11111111.11111110.00000000

network00001010.01000111.01100000.00000000

broadcast00001010.01000111.01100001.11111111

green = network part, grey = host part

hex0x0a476000

decimal172449792

reverse dns0.96.71.10.in-addr.arpa

ipv4-mapped::ffff:a47:6000

/23 split into /30 · 128 subnets

close ×

#	network	host range	broadcast
1	10.71.96.0/30	10.71.96.1 – 10.71.96.2	10.71.96.3
2	10.71.96.4/30	10.71.96.5 – 10.71.96.6	10.71.96.7
3	10.71.96.8/30	10.71.96.9 – 10.71.96.10	10.71.96.11
4	10.71.96.12/30	10.71.96.13 – 10.71.96.14	10.71.96.15
5	10.71.96.16/30	10.71.96.17 – 10.71.96.18	10.71.96.19
6	10.71.96.20/30	10.71.96.21 – 10.71.96.22	10.71.96.23
7	10.71.96.24/30	10.71.96.25 – 10.71.96.26	10.71.96.27
8	10.71.96.28/30	10.71.96.29 – 10.71.96.30	10.71.96.31
9	10.71.96.32/30	10.71.96.33 – 10.71.96.34	10.71.96.35
10	10.71.96.36/30	10.71.96.37 – 10.71.96.38	10.71.96.39
11	10.71.96.40/30	10.71.96.41 – 10.71.96.42	10.71.96.43
12	10.71.96.44/30	10.71.96.45 – 10.71.96.46	10.71.96.47
13	10.71.96.48/30	10.71.96.49 – 10.71.96.50	10.71.96.51
14	10.71.96.52/30	10.71.96.53 – 10.71.96.54	10.71.96.55
15	10.71.96.56/30	10.71.96.57 – 10.71.96.58	10.71.96.59
16	10.71.96.60/30	10.71.96.61 – 10.71.96.62	10.71.96.63
17	10.71.96.64/30	10.71.96.65 – 10.71.96.66	10.71.96.67
18	10.71.96.68/30	10.71.96.69 – 10.71.96.70	10.71.96.71
19	10.71.96.72/30	10.71.96.73 – 10.71.96.74	10.71.96.75
20	10.71.96.76/30	10.71.96.77 – 10.71.96.78	10.71.96.79
21	10.71.96.80/30	10.71.96.81 – 10.71.96.82	10.71.96.83
22	10.71.96.84/30	10.71.96.85 – 10.71.96.86	10.71.96.87
23	10.71.96.88/30	10.71.96.89 – 10.71.96.90	10.71.96.91
24	10.71.96.92/30	10.71.96.93 – 10.71.96.94	10.71.96.95
25	10.71.96.96/30	10.71.96.97 – 10.71.96.98	10.71.96.99
26	10.71.96.100/30	10.71.96.101 – 10.71.96.102	10.71.96.103
27	10.71.96.104/30	10.71.96.105 – 10.71.96.106	10.71.96.107
28	10.71.96.108/30	10.71.96.109 – 10.71.96.110	10.71.96.111
29	10.71.96.112/30	10.71.96.113 – 10.71.96.114	10.71.96.115
30	10.71.96.116/30	10.71.96.117 – 10.71.96.118	10.71.96.119
31	10.71.96.120/30	10.71.96.121 – 10.71.96.122	10.71.96.123
32	10.71.96.124/30	10.71.96.125 – 10.71.96.126	10.71.96.127
33	10.71.96.128/30	10.71.96.129 – 10.71.96.130	10.71.96.131
34	10.71.96.132/30	10.71.96.133 – 10.71.96.134	10.71.96.135
35	10.71.96.136/30	10.71.96.137 – 10.71.96.138	10.71.96.139
36	10.71.96.140/30	10.71.96.141 – 10.71.96.142	10.71.96.143
37	10.71.96.144/30	10.71.96.145 – 10.71.96.146	10.71.96.147
38	10.71.96.148/30	10.71.96.149 – 10.71.96.150	10.71.96.151
39	10.71.96.152/30	10.71.96.153 – 10.71.96.154	10.71.96.155
40	10.71.96.156/30	10.71.96.157 – 10.71.96.158	10.71.96.159
41	10.71.96.160/30	10.71.96.161 – 10.71.96.162	10.71.96.163
42	10.71.96.164/30	10.71.96.165 – 10.71.96.166	10.71.96.167
43	10.71.96.168/30	10.71.96.169 – 10.71.96.170	10.71.96.171
44	10.71.96.172/30	10.71.96.173 – 10.71.96.174	10.71.96.175
45	10.71.96.176/30	10.71.96.177 – 10.71.96.178	10.71.96.179
46	10.71.96.180/30	10.71.96.181 – 10.71.96.182	10.71.96.183
47	10.71.96.184/30	10.71.96.185 – 10.71.96.186	10.71.96.187
48	10.71.96.188/30	10.71.96.189 – 10.71.96.190	10.71.96.191
49	10.71.96.192/30	10.71.96.193 – 10.71.96.194	10.71.96.195
50	10.71.96.196/30	10.71.96.197 – 10.71.96.198	10.71.96.199
51	10.71.96.200/30	10.71.96.201 – 10.71.96.202	10.71.96.203
52	10.71.96.204/30	10.71.96.205 – 10.71.96.206	10.71.96.207
53	10.71.96.208/30	10.71.96.209 – 10.71.96.210	10.71.96.211
54	10.71.96.212/30	10.71.96.213 – 10.71.96.214	10.71.96.215
55	10.71.96.216/30	10.71.96.217 – 10.71.96.218	10.71.96.219
56	10.71.96.220/30	10.71.96.221 – 10.71.96.222	10.71.96.223
57	10.71.96.224/30	10.71.96.225 – 10.71.96.226	10.71.96.227
58	10.71.96.228/30	10.71.96.229 – 10.71.96.230	10.71.96.231
59	10.71.96.232/30	10.71.96.233 – 10.71.96.234	10.71.96.235
60	10.71.96.236/30	10.71.96.237 – 10.71.96.238	10.71.96.239
61	10.71.96.240/30	10.71.96.241 – 10.71.96.242	10.71.96.243
62	10.71.96.244/30	10.71.96.245 – 10.71.96.246	10.71.96.247
63	10.71.96.248/30	10.71.96.249 – 10.71.96.250	10.71.96.251
64	10.71.96.252/30	10.71.96.253 – 10.71.96.254	10.71.96.255
65	10.71.97.0/30	10.71.97.1 – 10.71.97.2	10.71.97.3
66	10.71.97.4/30	10.71.97.5 – 10.71.97.6	10.71.97.7
67	10.71.97.8/30	10.71.97.9 – 10.71.97.10	10.71.97.11
68	10.71.97.12/30	10.71.97.13 – 10.71.97.14	10.71.97.15
69	10.71.97.16/30	10.71.97.17 – 10.71.97.18	10.71.97.19
70	10.71.97.20/30	10.71.97.21 – 10.71.97.22	10.71.97.23
71	10.71.97.24/30	10.71.97.25 – 10.71.97.26	10.71.97.27
72	10.71.97.28/30	10.71.97.29 – 10.71.97.30	10.71.97.31
73	10.71.97.32/30	10.71.97.33 – 10.71.97.34	10.71.97.35
74	10.71.97.36/30	10.71.97.37 – 10.71.97.38	10.71.97.39
75	10.71.97.40/30	10.71.97.41 – 10.71.97.42	10.71.97.43
76	10.71.97.44/30	10.71.97.45 – 10.71.97.46	10.71.97.47
77	10.71.97.48/30	10.71.97.49 – 10.71.97.50	10.71.97.51
78	10.71.97.52/30	10.71.97.53 – 10.71.97.54	10.71.97.55
79	10.71.97.56/30	10.71.97.57 – 10.71.97.58	10.71.97.59
80	10.71.97.60/30	10.71.97.61 – 10.71.97.62	10.71.97.63
81	10.71.97.64/30	10.71.97.65 – 10.71.97.66	10.71.97.67
82	10.71.97.68/30	10.71.97.69 – 10.71.97.70	10.71.97.71
83	10.71.97.72/30	10.71.97.73 – 10.71.97.74	10.71.97.75
84	10.71.97.76/30	10.71.97.77 – 10.71.97.78	10.71.97.79
85	10.71.97.80/30	10.71.97.81 – 10.71.97.82	10.71.97.83
86	10.71.97.84/30	10.71.97.85 – 10.71.97.86	10.71.97.87
87	10.71.97.88/30	10.71.97.89 – 10.71.97.90	10.71.97.91
88	10.71.97.92/30	10.71.97.93 – 10.71.97.94	10.71.97.95
89	10.71.97.96/30	10.71.97.97 – 10.71.97.98	10.71.97.99
90	10.71.97.100/30	10.71.97.101 – 10.71.97.102	10.71.97.103
91	10.71.97.104/30	10.71.97.105 – 10.71.97.106	10.71.97.107
92	10.71.97.108/30	10.71.97.109 – 10.71.97.110	10.71.97.111
93	10.71.97.112/30	10.71.97.113 – 10.71.97.114	10.71.97.115
94	10.71.97.116/30	10.71.97.117 – 10.71.97.118	10.71.97.119
95	10.71.97.120/30	10.71.97.121 – 10.71.97.122	10.71.97.123
96	10.71.97.124/30	10.71.97.125 – 10.71.97.126	10.71.97.127
97	10.71.97.128/30	10.71.97.129 – 10.71.97.130	10.71.97.131
98	10.71.97.132/30	10.71.97.133 – 10.71.97.134	10.71.97.135
99	10.71.97.136/30	10.71.97.137 – 10.71.97.138	10.71.97.139
100	10.71.97.140/30	10.71.97.141 – 10.71.97.142	10.71.97.143
101	10.71.97.144/30	10.71.97.145 – 10.71.97.146	10.71.97.147
102	10.71.97.148/30	10.71.97.149 – 10.71.97.150	10.71.97.151
103	10.71.97.152/30	10.71.97.153 – 10.71.97.154	10.71.97.155
104	10.71.97.156/30	10.71.97.157 – 10.71.97.158	10.71.97.159
105	10.71.97.160/30	10.71.97.161 – 10.71.97.162	10.71.97.163
106	10.71.97.164/30	10.71.97.165 – 10.71.97.166	10.71.97.167
107	10.71.97.168/30	10.71.97.169 – 10.71.97.170	10.71.97.171
108	10.71.97.172/30	10.71.97.173 – 10.71.97.174	10.71.97.175
109	10.71.97.176/30	10.71.97.177 – 10.71.97.178	10.71.97.179
110	10.71.97.180/30	10.71.97.181 – 10.71.97.182	10.71.97.183
111	10.71.97.184/30	10.71.97.185 – 10.71.97.186	10.71.97.187
112	10.71.97.188/30	10.71.97.189 – 10.71.97.190	10.71.97.191
113	10.71.97.192/30	10.71.97.193 – 10.71.97.194	10.71.97.195
114	10.71.97.196/30	10.71.97.197 – 10.71.97.198	10.71.97.199
115	10.71.97.200/30	10.71.97.201 – 10.71.97.202	10.71.97.203
116	10.71.97.204/30	10.71.97.205 – 10.71.97.206	10.71.97.207
117	10.71.97.208/30	10.71.97.209 – 10.71.97.210	10.71.97.211
118	10.71.97.212/30	10.71.97.213 – 10.71.97.214	10.71.97.215
119	10.71.97.216/30	10.71.97.217 – 10.71.97.218	10.71.97.219
120	10.71.97.220/30	10.71.97.221 – 10.71.97.222	10.71.97.223
121	10.71.97.224/30	10.71.97.225 – 10.71.97.226	10.71.97.227
122	10.71.97.228/30	10.71.97.229 – 10.71.97.230	10.71.97.231
123	10.71.97.232/30	10.71.97.233 – 10.71.97.234	10.71.97.235
124	10.71.97.236/30	10.71.97.237 – 10.71.97.238	10.71.97.239
125	10.71.97.240/30	10.71.97.241 – 10.71.97.242	10.71.97.243
126	10.71.97.244/30	10.71.97.245 – 10.71.97.246	10.71.97.247
127	10.71.97.248/30	10.71.97.249 – 10.71.97.250	10.71.97.251
128	10.71.97.252/30	10.71.97.253 – 10.71.97.254	10.71.97.255

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 →