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)10.71.252.0/23

network10.71.252.0/23

broadcast10.71.253.255

first host10.71.252.1

last host10.71.253.254

subnet mask255.255.254.0

wildcard0.0.1.255

addresses512

usable hosts510

classA

ipcalc 10.71.252.0/23

address00001010.01000111.11111100.00000000

subnet mask11111111.11111111.11111110.00000000

network00001010.01000111.11111100.00000000

broadcast00001010.01000111.11111101.11111111

green = network part, grey = host part

hex0x0a47fc00

decimal172489728

reverse dns0.252.71.10.in-addr.arpa

ipv4-mapped::ffff:a47:fc00

/23 split into /30 · 128 subnets

close ×

#	network	host range	broadcast
1	10.71.252.0/30	10.71.252.1 – 10.71.252.2	10.71.252.3
2	10.71.252.4/30	10.71.252.5 – 10.71.252.6	10.71.252.7
3	10.71.252.8/30	10.71.252.9 – 10.71.252.10	10.71.252.11
4	10.71.252.12/30	10.71.252.13 – 10.71.252.14	10.71.252.15
5	10.71.252.16/30	10.71.252.17 – 10.71.252.18	10.71.252.19
6	10.71.252.20/30	10.71.252.21 – 10.71.252.22	10.71.252.23
7	10.71.252.24/30	10.71.252.25 – 10.71.252.26	10.71.252.27
8	10.71.252.28/30	10.71.252.29 – 10.71.252.30	10.71.252.31
9	10.71.252.32/30	10.71.252.33 – 10.71.252.34	10.71.252.35
10	10.71.252.36/30	10.71.252.37 – 10.71.252.38	10.71.252.39
11	10.71.252.40/30	10.71.252.41 – 10.71.252.42	10.71.252.43
12	10.71.252.44/30	10.71.252.45 – 10.71.252.46	10.71.252.47
13	10.71.252.48/30	10.71.252.49 – 10.71.252.50	10.71.252.51
14	10.71.252.52/30	10.71.252.53 – 10.71.252.54	10.71.252.55
15	10.71.252.56/30	10.71.252.57 – 10.71.252.58	10.71.252.59
16	10.71.252.60/30	10.71.252.61 – 10.71.252.62	10.71.252.63
17	10.71.252.64/30	10.71.252.65 – 10.71.252.66	10.71.252.67
18	10.71.252.68/30	10.71.252.69 – 10.71.252.70	10.71.252.71
19	10.71.252.72/30	10.71.252.73 – 10.71.252.74	10.71.252.75
20	10.71.252.76/30	10.71.252.77 – 10.71.252.78	10.71.252.79
21	10.71.252.80/30	10.71.252.81 – 10.71.252.82	10.71.252.83
22	10.71.252.84/30	10.71.252.85 – 10.71.252.86	10.71.252.87
23	10.71.252.88/30	10.71.252.89 – 10.71.252.90	10.71.252.91
24	10.71.252.92/30	10.71.252.93 – 10.71.252.94	10.71.252.95
25	10.71.252.96/30	10.71.252.97 – 10.71.252.98	10.71.252.99
26	10.71.252.100/30	10.71.252.101 – 10.71.252.102	10.71.252.103
27	10.71.252.104/30	10.71.252.105 – 10.71.252.106	10.71.252.107
28	10.71.252.108/30	10.71.252.109 – 10.71.252.110	10.71.252.111
29	10.71.252.112/30	10.71.252.113 – 10.71.252.114	10.71.252.115
30	10.71.252.116/30	10.71.252.117 – 10.71.252.118	10.71.252.119
31	10.71.252.120/30	10.71.252.121 – 10.71.252.122	10.71.252.123
32	10.71.252.124/30	10.71.252.125 – 10.71.252.126	10.71.252.127
33	10.71.252.128/30	10.71.252.129 – 10.71.252.130	10.71.252.131
34	10.71.252.132/30	10.71.252.133 – 10.71.252.134	10.71.252.135
35	10.71.252.136/30	10.71.252.137 – 10.71.252.138	10.71.252.139
36	10.71.252.140/30	10.71.252.141 – 10.71.252.142	10.71.252.143
37	10.71.252.144/30	10.71.252.145 – 10.71.252.146	10.71.252.147
38	10.71.252.148/30	10.71.252.149 – 10.71.252.150	10.71.252.151
39	10.71.252.152/30	10.71.252.153 – 10.71.252.154	10.71.252.155
40	10.71.252.156/30	10.71.252.157 – 10.71.252.158	10.71.252.159
41	10.71.252.160/30	10.71.252.161 – 10.71.252.162	10.71.252.163
42	10.71.252.164/30	10.71.252.165 – 10.71.252.166	10.71.252.167
43	10.71.252.168/30	10.71.252.169 – 10.71.252.170	10.71.252.171
44	10.71.252.172/30	10.71.252.173 – 10.71.252.174	10.71.252.175
45	10.71.252.176/30	10.71.252.177 – 10.71.252.178	10.71.252.179
46	10.71.252.180/30	10.71.252.181 – 10.71.252.182	10.71.252.183
47	10.71.252.184/30	10.71.252.185 – 10.71.252.186	10.71.252.187
48	10.71.252.188/30	10.71.252.189 – 10.71.252.190	10.71.252.191
49	10.71.252.192/30	10.71.252.193 – 10.71.252.194	10.71.252.195
50	10.71.252.196/30	10.71.252.197 – 10.71.252.198	10.71.252.199
51	10.71.252.200/30	10.71.252.201 – 10.71.252.202	10.71.252.203
52	10.71.252.204/30	10.71.252.205 – 10.71.252.206	10.71.252.207
53	10.71.252.208/30	10.71.252.209 – 10.71.252.210	10.71.252.211
54	10.71.252.212/30	10.71.252.213 – 10.71.252.214	10.71.252.215
55	10.71.252.216/30	10.71.252.217 – 10.71.252.218	10.71.252.219
56	10.71.252.220/30	10.71.252.221 – 10.71.252.222	10.71.252.223
57	10.71.252.224/30	10.71.252.225 – 10.71.252.226	10.71.252.227
58	10.71.252.228/30	10.71.252.229 – 10.71.252.230	10.71.252.231
59	10.71.252.232/30	10.71.252.233 – 10.71.252.234	10.71.252.235
60	10.71.252.236/30	10.71.252.237 – 10.71.252.238	10.71.252.239
61	10.71.252.240/30	10.71.252.241 – 10.71.252.242	10.71.252.243
62	10.71.252.244/30	10.71.252.245 – 10.71.252.246	10.71.252.247
63	10.71.252.248/30	10.71.252.249 – 10.71.252.250	10.71.252.251
64	10.71.252.252/30	10.71.252.253 – 10.71.252.254	10.71.252.255
65	10.71.253.0/30	10.71.253.1 – 10.71.253.2	10.71.253.3
66	10.71.253.4/30	10.71.253.5 – 10.71.253.6	10.71.253.7
67	10.71.253.8/30	10.71.253.9 – 10.71.253.10	10.71.253.11
68	10.71.253.12/30	10.71.253.13 – 10.71.253.14	10.71.253.15
69	10.71.253.16/30	10.71.253.17 – 10.71.253.18	10.71.253.19
70	10.71.253.20/30	10.71.253.21 – 10.71.253.22	10.71.253.23
71	10.71.253.24/30	10.71.253.25 – 10.71.253.26	10.71.253.27
72	10.71.253.28/30	10.71.253.29 – 10.71.253.30	10.71.253.31
73	10.71.253.32/30	10.71.253.33 – 10.71.253.34	10.71.253.35
74	10.71.253.36/30	10.71.253.37 – 10.71.253.38	10.71.253.39
75	10.71.253.40/30	10.71.253.41 – 10.71.253.42	10.71.253.43
76	10.71.253.44/30	10.71.253.45 – 10.71.253.46	10.71.253.47
77	10.71.253.48/30	10.71.253.49 – 10.71.253.50	10.71.253.51
78	10.71.253.52/30	10.71.253.53 – 10.71.253.54	10.71.253.55
79	10.71.253.56/30	10.71.253.57 – 10.71.253.58	10.71.253.59
80	10.71.253.60/30	10.71.253.61 – 10.71.253.62	10.71.253.63
81	10.71.253.64/30	10.71.253.65 – 10.71.253.66	10.71.253.67
82	10.71.253.68/30	10.71.253.69 – 10.71.253.70	10.71.253.71
83	10.71.253.72/30	10.71.253.73 – 10.71.253.74	10.71.253.75
84	10.71.253.76/30	10.71.253.77 – 10.71.253.78	10.71.253.79
85	10.71.253.80/30	10.71.253.81 – 10.71.253.82	10.71.253.83
86	10.71.253.84/30	10.71.253.85 – 10.71.253.86	10.71.253.87
87	10.71.253.88/30	10.71.253.89 – 10.71.253.90	10.71.253.91
88	10.71.253.92/30	10.71.253.93 – 10.71.253.94	10.71.253.95
89	10.71.253.96/30	10.71.253.97 – 10.71.253.98	10.71.253.99
90	10.71.253.100/30	10.71.253.101 – 10.71.253.102	10.71.253.103
91	10.71.253.104/30	10.71.253.105 – 10.71.253.106	10.71.253.107
92	10.71.253.108/30	10.71.253.109 – 10.71.253.110	10.71.253.111
93	10.71.253.112/30	10.71.253.113 – 10.71.253.114	10.71.253.115
94	10.71.253.116/30	10.71.253.117 – 10.71.253.118	10.71.253.119
95	10.71.253.120/30	10.71.253.121 – 10.71.253.122	10.71.253.123
96	10.71.253.124/30	10.71.253.125 – 10.71.253.126	10.71.253.127
97	10.71.253.128/30	10.71.253.129 – 10.71.253.130	10.71.253.131
98	10.71.253.132/30	10.71.253.133 – 10.71.253.134	10.71.253.135
99	10.71.253.136/30	10.71.253.137 – 10.71.253.138	10.71.253.139
100	10.71.253.140/30	10.71.253.141 – 10.71.253.142	10.71.253.143
101	10.71.253.144/30	10.71.253.145 – 10.71.253.146	10.71.253.147
102	10.71.253.148/30	10.71.253.149 – 10.71.253.150	10.71.253.151
103	10.71.253.152/30	10.71.253.153 – 10.71.253.154	10.71.253.155
104	10.71.253.156/30	10.71.253.157 – 10.71.253.158	10.71.253.159
105	10.71.253.160/30	10.71.253.161 – 10.71.253.162	10.71.253.163
106	10.71.253.164/30	10.71.253.165 – 10.71.253.166	10.71.253.167
107	10.71.253.168/30	10.71.253.169 – 10.71.253.170	10.71.253.171
108	10.71.253.172/30	10.71.253.173 – 10.71.253.174	10.71.253.175
109	10.71.253.176/30	10.71.253.177 – 10.71.253.178	10.71.253.179
110	10.71.253.180/30	10.71.253.181 – 10.71.253.182	10.71.253.183
111	10.71.253.184/30	10.71.253.185 – 10.71.253.186	10.71.253.187
112	10.71.253.188/30	10.71.253.189 – 10.71.253.190	10.71.253.191
113	10.71.253.192/30	10.71.253.193 – 10.71.253.194	10.71.253.195
114	10.71.253.196/30	10.71.253.197 – 10.71.253.198	10.71.253.199
115	10.71.253.200/30	10.71.253.201 – 10.71.253.202	10.71.253.203
116	10.71.253.204/30	10.71.253.205 – 10.71.253.206	10.71.253.207
117	10.71.253.208/30	10.71.253.209 – 10.71.253.210	10.71.253.211
118	10.71.253.212/30	10.71.253.213 – 10.71.253.214	10.71.253.215
119	10.71.253.216/30	10.71.253.217 – 10.71.253.218	10.71.253.219
120	10.71.253.220/30	10.71.253.221 – 10.71.253.222	10.71.253.223
121	10.71.253.224/30	10.71.253.225 – 10.71.253.226	10.71.253.227
122	10.71.253.228/30	10.71.253.229 – 10.71.253.230	10.71.253.231
123	10.71.253.232/30	10.71.253.233 – 10.71.253.234	10.71.253.235
124	10.71.253.236/30	10.71.253.237 – 10.71.253.238	10.71.253.239
125	10.71.253.240/30	10.71.253.241 – 10.71.253.242	10.71.253.243
126	10.71.253.244/30	10.71.253.245 – 10.71.253.246	10.71.253.247
127	10.71.253.248/30	10.71.253.249 – 10.71.253.250	10.71.253.251
128	10.71.253.252/30	10.71.253.253 – 10.71.253.254	10.71.253.255

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 →