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)10.2.170.0/24

network10.2.170.0/24

broadcast10.2.170.255

first host10.2.170.1

last host10.2.170.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.2.170.0/24

address00001010.00000010.10101010.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.00000010.10101010.00000000

broadcast00001010.00000010.10101010.11111111

green = network part, grey = host part

hex0x0a02aa00

decimal167946752

reverse dns0.170.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:aa00

/24 split into /31 · 128 subnets

close ×

#	network	host range	broadcast
1	10.2.170.0/31	10.2.170.0 – 10.2.170.1	10.2.170.1
2	10.2.170.2/31	10.2.170.2 – 10.2.170.3	10.2.170.3
3	10.2.170.4/31	10.2.170.4 – 10.2.170.5	10.2.170.5
4	10.2.170.6/31	10.2.170.6 – 10.2.170.7	10.2.170.7
5	10.2.170.8/31	10.2.170.8 – 10.2.170.9	10.2.170.9
6	10.2.170.10/31	10.2.170.10 – 10.2.170.11	10.2.170.11
7	10.2.170.12/31	10.2.170.12 – 10.2.170.13	10.2.170.13
8	10.2.170.14/31	10.2.170.14 – 10.2.170.15	10.2.170.15
9	10.2.170.16/31	10.2.170.16 – 10.2.170.17	10.2.170.17
10	10.2.170.18/31	10.2.170.18 – 10.2.170.19	10.2.170.19
11	10.2.170.20/31	10.2.170.20 – 10.2.170.21	10.2.170.21
12	10.2.170.22/31	10.2.170.22 – 10.2.170.23	10.2.170.23
13	10.2.170.24/31	10.2.170.24 – 10.2.170.25	10.2.170.25
14	10.2.170.26/31	10.2.170.26 – 10.2.170.27	10.2.170.27
15	10.2.170.28/31	10.2.170.28 – 10.2.170.29	10.2.170.29
16	10.2.170.30/31	10.2.170.30 – 10.2.170.31	10.2.170.31
17	10.2.170.32/31	10.2.170.32 – 10.2.170.33	10.2.170.33
18	10.2.170.34/31	10.2.170.34 – 10.2.170.35	10.2.170.35
19	10.2.170.36/31	10.2.170.36 – 10.2.170.37	10.2.170.37
20	10.2.170.38/31	10.2.170.38 – 10.2.170.39	10.2.170.39
21	10.2.170.40/31	10.2.170.40 – 10.2.170.41	10.2.170.41
22	10.2.170.42/31	10.2.170.42 – 10.2.170.43	10.2.170.43
23	10.2.170.44/31	10.2.170.44 – 10.2.170.45	10.2.170.45
24	10.2.170.46/31	10.2.170.46 – 10.2.170.47	10.2.170.47
25	10.2.170.48/31	10.2.170.48 – 10.2.170.49	10.2.170.49
26	10.2.170.50/31	10.2.170.50 – 10.2.170.51	10.2.170.51
27	10.2.170.52/31	10.2.170.52 – 10.2.170.53	10.2.170.53
28	10.2.170.54/31	10.2.170.54 – 10.2.170.55	10.2.170.55
29	10.2.170.56/31	10.2.170.56 – 10.2.170.57	10.2.170.57
30	10.2.170.58/31	10.2.170.58 – 10.2.170.59	10.2.170.59
31	10.2.170.60/31	10.2.170.60 – 10.2.170.61	10.2.170.61
32	10.2.170.62/31	10.2.170.62 – 10.2.170.63	10.2.170.63
33	10.2.170.64/31	10.2.170.64 – 10.2.170.65	10.2.170.65
34	10.2.170.66/31	10.2.170.66 – 10.2.170.67	10.2.170.67
35	10.2.170.68/31	10.2.170.68 – 10.2.170.69	10.2.170.69
36	10.2.170.70/31	10.2.170.70 – 10.2.170.71	10.2.170.71
37	10.2.170.72/31	10.2.170.72 – 10.2.170.73	10.2.170.73
38	10.2.170.74/31	10.2.170.74 – 10.2.170.75	10.2.170.75
39	10.2.170.76/31	10.2.170.76 – 10.2.170.77	10.2.170.77
40	10.2.170.78/31	10.2.170.78 – 10.2.170.79	10.2.170.79
41	10.2.170.80/31	10.2.170.80 – 10.2.170.81	10.2.170.81
42	10.2.170.82/31	10.2.170.82 – 10.2.170.83	10.2.170.83
43	10.2.170.84/31	10.2.170.84 – 10.2.170.85	10.2.170.85
44	10.2.170.86/31	10.2.170.86 – 10.2.170.87	10.2.170.87
45	10.2.170.88/31	10.2.170.88 – 10.2.170.89	10.2.170.89
46	10.2.170.90/31	10.2.170.90 – 10.2.170.91	10.2.170.91
47	10.2.170.92/31	10.2.170.92 – 10.2.170.93	10.2.170.93
48	10.2.170.94/31	10.2.170.94 – 10.2.170.95	10.2.170.95
49	10.2.170.96/31	10.2.170.96 – 10.2.170.97	10.2.170.97
50	10.2.170.98/31	10.2.170.98 – 10.2.170.99	10.2.170.99
51	10.2.170.100/31	10.2.170.100 – 10.2.170.101	10.2.170.101
52	10.2.170.102/31	10.2.170.102 – 10.2.170.103	10.2.170.103
53	10.2.170.104/31	10.2.170.104 – 10.2.170.105	10.2.170.105
54	10.2.170.106/31	10.2.170.106 – 10.2.170.107	10.2.170.107
55	10.2.170.108/31	10.2.170.108 – 10.2.170.109	10.2.170.109
56	10.2.170.110/31	10.2.170.110 – 10.2.170.111	10.2.170.111
57	10.2.170.112/31	10.2.170.112 – 10.2.170.113	10.2.170.113
58	10.2.170.114/31	10.2.170.114 – 10.2.170.115	10.2.170.115
59	10.2.170.116/31	10.2.170.116 – 10.2.170.117	10.2.170.117
60	10.2.170.118/31	10.2.170.118 – 10.2.170.119	10.2.170.119
61	10.2.170.120/31	10.2.170.120 – 10.2.170.121	10.2.170.121
62	10.2.170.122/31	10.2.170.122 – 10.2.170.123	10.2.170.123
63	10.2.170.124/31	10.2.170.124 – 10.2.170.125	10.2.170.125
64	10.2.170.126/31	10.2.170.126 – 10.2.170.127	10.2.170.127
65	10.2.170.128/31	10.2.170.128 – 10.2.170.129	10.2.170.129
66	10.2.170.130/31	10.2.170.130 – 10.2.170.131	10.2.170.131
67	10.2.170.132/31	10.2.170.132 – 10.2.170.133	10.2.170.133
68	10.2.170.134/31	10.2.170.134 – 10.2.170.135	10.2.170.135
69	10.2.170.136/31	10.2.170.136 – 10.2.170.137	10.2.170.137
70	10.2.170.138/31	10.2.170.138 – 10.2.170.139	10.2.170.139
71	10.2.170.140/31	10.2.170.140 – 10.2.170.141	10.2.170.141
72	10.2.170.142/31	10.2.170.142 – 10.2.170.143	10.2.170.143
73	10.2.170.144/31	10.2.170.144 – 10.2.170.145	10.2.170.145
74	10.2.170.146/31	10.2.170.146 – 10.2.170.147	10.2.170.147
75	10.2.170.148/31	10.2.170.148 – 10.2.170.149	10.2.170.149
76	10.2.170.150/31	10.2.170.150 – 10.2.170.151	10.2.170.151
77	10.2.170.152/31	10.2.170.152 – 10.2.170.153	10.2.170.153
78	10.2.170.154/31	10.2.170.154 – 10.2.170.155	10.2.170.155
79	10.2.170.156/31	10.2.170.156 – 10.2.170.157	10.2.170.157
80	10.2.170.158/31	10.2.170.158 – 10.2.170.159	10.2.170.159
81	10.2.170.160/31	10.2.170.160 – 10.2.170.161	10.2.170.161
82	10.2.170.162/31	10.2.170.162 – 10.2.170.163	10.2.170.163
83	10.2.170.164/31	10.2.170.164 – 10.2.170.165	10.2.170.165
84	10.2.170.166/31	10.2.170.166 – 10.2.170.167	10.2.170.167
85	10.2.170.168/31	10.2.170.168 – 10.2.170.169	10.2.170.169
86	10.2.170.170/31	10.2.170.170 – 10.2.170.171	10.2.170.171
87	10.2.170.172/31	10.2.170.172 – 10.2.170.173	10.2.170.173
88	10.2.170.174/31	10.2.170.174 – 10.2.170.175	10.2.170.175
89	10.2.170.176/31	10.2.170.176 – 10.2.170.177	10.2.170.177
90	10.2.170.178/31	10.2.170.178 – 10.2.170.179	10.2.170.179
91	10.2.170.180/31	10.2.170.180 – 10.2.170.181	10.2.170.181
92	10.2.170.182/31	10.2.170.182 – 10.2.170.183	10.2.170.183
93	10.2.170.184/31	10.2.170.184 – 10.2.170.185	10.2.170.185
94	10.2.170.186/31	10.2.170.186 – 10.2.170.187	10.2.170.187
95	10.2.170.188/31	10.2.170.188 – 10.2.170.189	10.2.170.189
96	10.2.170.190/31	10.2.170.190 – 10.2.170.191	10.2.170.191
97	10.2.170.192/31	10.2.170.192 – 10.2.170.193	10.2.170.193
98	10.2.170.194/31	10.2.170.194 – 10.2.170.195	10.2.170.195
99	10.2.170.196/31	10.2.170.196 – 10.2.170.197	10.2.170.197
100	10.2.170.198/31	10.2.170.198 – 10.2.170.199	10.2.170.199
101	10.2.170.200/31	10.2.170.200 – 10.2.170.201	10.2.170.201
102	10.2.170.202/31	10.2.170.202 – 10.2.170.203	10.2.170.203
103	10.2.170.204/31	10.2.170.204 – 10.2.170.205	10.2.170.205
104	10.2.170.206/31	10.2.170.206 – 10.2.170.207	10.2.170.207
105	10.2.170.208/31	10.2.170.208 – 10.2.170.209	10.2.170.209
106	10.2.170.210/31	10.2.170.210 – 10.2.170.211	10.2.170.211
107	10.2.170.212/31	10.2.170.212 – 10.2.170.213	10.2.170.213
108	10.2.170.214/31	10.2.170.214 – 10.2.170.215	10.2.170.215
109	10.2.170.216/31	10.2.170.216 – 10.2.170.217	10.2.170.217
110	10.2.170.218/31	10.2.170.218 – 10.2.170.219	10.2.170.219
111	10.2.170.220/31	10.2.170.220 – 10.2.170.221	10.2.170.221
112	10.2.170.222/31	10.2.170.222 – 10.2.170.223	10.2.170.223
113	10.2.170.224/31	10.2.170.224 – 10.2.170.225	10.2.170.225
114	10.2.170.226/31	10.2.170.226 – 10.2.170.227	10.2.170.227
115	10.2.170.228/31	10.2.170.228 – 10.2.170.229	10.2.170.229
116	10.2.170.230/31	10.2.170.230 – 10.2.170.231	10.2.170.231
117	10.2.170.232/31	10.2.170.232 – 10.2.170.233	10.2.170.233
118	10.2.170.234/31	10.2.170.234 – 10.2.170.235	10.2.170.235
119	10.2.170.236/31	10.2.170.236 – 10.2.170.237	10.2.170.237
120	10.2.170.238/31	10.2.170.238 – 10.2.170.239	10.2.170.239
121	10.2.170.240/31	10.2.170.240 – 10.2.170.241	10.2.170.241
122	10.2.170.242/31	10.2.170.242 – 10.2.170.243	10.2.170.243
123	10.2.170.244/31	10.2.170.244 – 10.2.170.245	10.2.170.245
124	10.2.170.246/31	10.2.170.246 – 10.2.170.247	10.2.170.247
125	10.2.170.248/31	10.2.170.248 – 10.2.170.249	10.2.170.249
126	10.2.170.250/31	10.2.170.250 – 10.2.170.251	10.2.170.251
127	10.2.170.252/31	10.2.170.252 – 10.2.170.253	10.2.170.253
128	10.2.170.254/31	10.2.170.254 – 10.2.170.255	10.2.170.255

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 →