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)10.2.70.0/24

network10.2.70.0/24

broadcast10.2.70.255

first host10.2.70.1

last host10.2.70.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.2.70.0/24

address00001010.00000010.01000110.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.00000010.01000110.00000000

broadcast00001010.00000010.01000110.11111111

green = network part, grey = host part

hex0x0a024600

decimal167921152

reverse dns0.70.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:4600

/24 split into /31 · 128 subnets

close ×

#	network	host range	broadcast
1	10.2.70.0/31	10.2.70.0 – 10.2.70.1	10.2.70.1
2	10.2.70.2/31	10.2.70.2 – 10.2.70.3	10.2.70.3
3	10.2.70.4/31	10.2.70.4 – 10.2.70.5	10.2.70.5
4	10.2.70.6/31	10.2.70.6 – 10.2.70.7	10.2.70.7
5	10.2.70.8/31	10.2.70.8 – 10.2.70.9	10.2.70.9
6	10.2.70.10/31	10.2.70.10 – 10.2.70.11	10.2.70.11
7	10.2.70.12/31	10.2.70.12 – 10.2.70.13	10.2.70.13
8	10.2.70.14/31	10.2.70.14 – 10.2.70.15	10.2.70.15
9	10.2.70.16/31	10.2.70.16 – 10.2.70.17	10.2.70.17
10	10.2.70.18/31	10.2.70.18 – 10.2.70.19	10.2.70.19
11	10.2.70.20/31	10.2.70.20 – 10.2.70.21	10.2.70.21
12	10.2.70.22/31	10.2.70.22 – 10.2.70.23	10.2.70.23
13	10.2.70.24/31	10.2.70.24 – 10.2.70.25	10.2.70.25
14	10.2.70.26/31	10.2.70.26 – 10.2.70.27	10.2.70.27
15	10.2.70.28/31	10.2.70.28 – 10.2.70.29	10.2.70.29
16	10.2.70.30/31	10.2.70.30 – 10.2.70.31	10.2.70.31
17	10.2.70.32/31	10.2.70.32 – 10.2.70.33	10.2.70.33
18	10.2.70.34/31	10.2.70.34 – 10.2.70.35	10.2.70.35
19	10.2.70.36/31	10.2.70.36 – 10.2.70.37	10.2.70.37
20	10.2.70.38/31	10.2.70.38 – 10.2.70.39	10.2.70.39
21	10.2.70.40/31	10.2.70.40 – 10.2.70.41	10.2.70.41
22	10.2.70.42/31	10.2.70.42 – 10.2.70.43	10.2.70.43
23	10.2.70.44/31	10.2.70.44 – 10.2.70.45	10.2.70.45
24	10.2.70.46/31	10.2.70.46 – 10.2.70.47	10.2.70.47
25	10.2.70.48/31	10.2.70.48 – 10.2.70.49	10.2.70.49
26	10.2.70.50/31	10.2.70.50 – 10.2.70.51	10.2.70.51
27	10.2.70.52/31	10.2.70.52 – 10.2.70.53	10.2.70.53
28	10.2.70.54/31	10.2.70.54 – 10.2.70.55	10.2.70.55
29	10.2.70.56/31	10.2.70.56 – 10.2.70.57	10.2.70.57
30	10.2.70.58/31	10.2.70.58 – 10.2.70.59	10.2.70.59
31	10.2.70.60/31	10.2.70.60 – 10.2.70.61	10.2.70.61
32	10.2.70.62/31	10.2.70.62 – 10.2.70.63	10.2.70.63
33	10.2.70.64/31	10.2.70.64 – 10.2.70.65	10.2.70.65
34	10.2.70.66/31	10.2.70.66 – 10.2.70.67	10.2.70.67
35	10.2.70.68/31	10.2.70.68 – 10.2.70.69	10.2.70.69
36	10.2.70.70/31	10.2.70.70 – 10.2.70.71	10.2.70.71
37	10.2.70.72/31	10.2.70.72 – 10.2.70.73	10.2.70.73
38	10.2.70.74/31	10.2.70.74 – 10.2.70.75	10.2.70.75
39	10.2.70.76/31	10.2.70.76 – 10.2.70.77	10.2.70.77
40	10.2.70.78/31	10.2.70.78 – 10.2.70.79	10.2.70.79
41	10.2.70.80/31	10.2.70.80 – 10.2.70.81	10.2.70.81
42	10.2.70.82/31	10.2.70.82 – 10.2.70.83	10.2.70.83
43	10.2.70.84/31	10.2.70.84 – 10.2.70.85	10.2.70.85
44	10.2.70.86/31	10.2.70.86 – 10.2.70.87	10.2.70.87
45	10.2.70.88/31	10.2.70.88 – 10.2.70.89	10.2.70.89
46	10.2.70.90/31	10.2.70.90 – 10.2.70.91	10.2.70.91
47	10.2.70.92/31	10.2.70.92 – 10.2.70.93	10.2.70.93
48	10.2.70.94/31	10.2.70.94 – 10.2.70.95	10.2.70.95
49	10.2.70.96/31	10.2.70.96 – 10.2.70.97	10.2.70.97
50	10.2.70.98/31	10.2.70.98 – 10.2.70.99	10.2.70.99
51	10.2.70.100/31	10.2.70.100 – 10.2.70.101	10.2.70.101
52	10.2.70.102/31	10.2.70.102 – 10.2.70.103	10.2.70.103
53	10.2.70.104/31	10.2.70.104 – 10.2.70.105	10.2.70.105
54	10.2.70.106/31	10.2.70.106 – 10.2.70.107	10.2.70.107
55	10.2.70.108/31	10.2.70.108 – 10.2.70.109	10.2.70.109
56	10.2.70.110/31	10.2.70.110 – 10.2.70.111	10.2.70.111
57	10.2.70.112/31	10.2.70.112 – 10.2.70.113	10.2.70.113
58	10.2.70.114/31	10.2.70.114 – 10.2.70.115	10.2.70.115
59	10.2.70.116/31	10.2.70.116 – 10.2.70.117	10.2.70.117
60	10.2.70.118/31	10.2.70.118 – 10.2.70.119	10.2.70.119
61	10.2.70.120/31	10.2.70.120 – 10.2.70.121	10.2.70.121
62	10.2.70.122/31	10.2.70.122 – 10.2.70.123	10.2.70.123
63	10.2.70.124/31	10.2.70.124 – 10.2.70.125	10.2.70.125
64	10.2.70.126/31	10.2.70.126 – 10.2.70.127	10.2.70.127
65	10.2.70.128/31	10.2.70.128 – 10.2.70.129	10.2.70.129
66	10.2.70.130/31	10.2.70.130 – 10.2.70.131	10.2.70.131
67	10.2.70.132/31	10.2.70.132 – 10.2.70.133	10.2.70.133
68	10.2.70.134/31	10.2.70.134 – 10.2.70.135	10.2.70.135
69	10.2.70.136/31	10.2.70.136 – 10.2.70.137	10.2.70.137
70	10.2.70.138/31	10.2.70.138 – 10.2.70.139	10.2.70.139
71	10.2.70.140/31	10.2.70.140 – 10.2.70.141	10.2.70.141
72	10.2.70.142/31	10.2.70.142 – 10.2.70.143	10.2.70.143
73	10.2.70.144/31	10.2.70.144 – 10.2.70.145	10.2.70.145
74	10.2.70.146/31	10.2.70.146 – 10.2.70.147	10.2.70.147
75	10.2.70.148/31	10.2.70.148 – 10.2.70.149	10.2.70.149
76	10.2.70.150/31	10.2.70.150 – 10.2.70.151	10.2.70.151
77	10.2.70.152/31	10.2.70.152 – 10.2.70.153	10.2.70.153
78	10.2.70.154/31	10.2.70.154 – 10.2.70.155	10.2.70.155
79	10.2.70.156/31	10.2.70.156 – 10.2.70.157	10.2.70.157
80	10.2.70.158/31	10.2.70.158 – 10.2.70.159	10.2.70.159
81	10.2.70.160/31	10.2.70.160 – 10.2.70.161	10.2.70.161
82	10.2.70.162/31	10.2.70.162 – 10.2.70.163	10.2.70.163
83	10.2.70.164/31	10.2.70.164 – 10.2.70.165	10.2.70.165
84	10.2.70.166/31	10.2.70.166 – 10.2.70.167	10.2.70.167
85	10.2.70.168/31	10.2.70.168 – 10.2.70.169	10.2.70.169
86	10.2.70.170/31	10.2.70.170 – 10.2.70.171	10.2.70.171
87	10.2.70.172/31	10.2.70.172 – 10.2.70.173	10.2.70.173
88	10.2.70.174/31	10.2.70.174 – 10.2.70.175	10.2.70.175
89	10.2.70.176/31	10.2.70.176 – 10.2.70.177	10.2.70.177
90	10.2.70.178/31	10.2.70.178 – 10.2.70.179	10.2.70.179
91	10.2.70.180/31	10.2.70.180 – 10.2.70.181	10.2.70.181
92	10.2.70.182/31	10.2.70.182 – 10.2.70.183	10.2.70.183
93	10.2.70.184/31	10.2.70.184 – 10.2.70.185	10.2.70.185
94	10.2.70.186/31	10.2.70.186 – 10.2.70.187	10.2.70.187
95	10.2.70.188/31	10.2.70.188 – 10.2.70.189	10.2.70.189
96	10.2.70.190/31	10.2.70.190 – 10.2.70.191	10.2.70.191
97	10.2.70.192/31	10.2.70.192 – 10.2.70.193	10.2.70.193
98	10.2.70.194/31	10.2.70.194 – 10.2.70.195	10.2.70.195
99	10.2.70.196/31	10.2.70.196 – 10.2.70.197	10.2.70.197
100	10.2.70.198/31	10.2.70.198 – 10.2.70.199	10.2.70.199
101	10.2.70.200/31	10.2.70.200 – 10.2.70.201	10.2.70.201
102	10.2.70.202/31	10.2.70.202 – 10.2.70.203	10.2.70.203
103	10.2.70.204/31	10.2.70.204 – 10.2.70.205	10.2.70.205
104	10.2.70.206/31	10.2.70.206 – 10.2.70.207	10.2.70.207
105	10.2.70.208/31	10.2.70.208 – 10.2.70.209	10.2.70.209
106	10.2.70.210/31	10.2.70.210 – 10.2.70.211	10.2.70.211
107	10.2.70.212/31	10.2.70.212 – 10.2.70.213	10.2.70.213
108	10.2.70.214/31	10.2.70.214 – 10.2.70.215	10.2.70.215
109	10.2.70.216/31	10.2.70.216 – 10.2.70.217	10.2.70.217
110	10.2.70.218/31	10.2.70.218 – 10.2.70.219	10.2.70.219
111	10.2.70.220/31	10.2.70.220 – 10.2.70.221	10.2.70.221
112	10.2.70.222/31	10.2.70.222 – 10.2.70.223	10.2.70.223
113	10.2.70.224/31	10.2.70.224 – 10.2.70.225	10.2.70.225
114	10.2.70.226/31	10.2.70.226 – 10.2.70.227	10.2.70.227
115	10.2.70.228/31	10.2.70.228 – 10.2.70.229	10.2.70.229
116	10.2.70.230/31	10.2.70.230 – 10.2.70.231	10.2.70.231
117	10.2.70.232/31	10.2.70.232 – 10.2.70.233	10.2.70.233
118	10.2.70.234/31	10.2.70.234 – 10.2.70.235	10.2.70.235
119	10.2.70.236/31	10.2.70.236 – 10.2.70.237	10.2.70.237
120	10.2.70.238/31	10.2.70.238 – 10.2.70.239	10.2.70.239
121	10.2.70.240/31	10.2.70.240 – 10.2.70.241	10.2.70.241
122	10.2.70.242/31	10.2.70.242 – 10.2.70.243	10.2.70.243
123	10.2.70.244/31	10.2.70.244 – 10.2.70.245	10.2.70.245
124	10.2.70.246/31	10.2.70.246 – 10.2.70.247	10.2.70.247
125	10.2.70.248/31	10.2.70.248 – 10.2.70.249	10.2.70.249
126	10.2.70.250/31	10.2.70.250 – 10.2.70.251	10.2.70.251
127	10.2.70.252/31	10.2.70.252 – 10.2.70.253	10.2.70.253
128	10.2.70.254/31	10.2.70.254 – 10.2.70.255	10.2.70.255

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 /24
/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	-
/24	255.255.255.0	256	254	1
/25	255.255.255.128	128	126	2 split →
/26	255.255.255.192	64	62	4 split →
/27	255.255.255.224	32	30	8 split →
/28	255.255.255.240	16	14	16 split →
/29	255.255.255.248	8	6	32 split →
/30	255.255.255.252	4	2	64 split →
/31	255.255.255.254	2	2	128 split →
/32	255.255.255.255	1	1	256 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 →