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)10.0.219.0/24

network10.0.219.0/24

broadcast10.0.219.255

first host10.0.219.1

last host10.0.219.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.0.219.0/24

address00001010.00000000.11011011.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.00000000.11011011.00000000

broadcast00001010.00000000.11011011.11111111

green = network part, grey = host part

hex0x0a00db00

decimal167828224

reverse dns0.219.0.10.in-addr.arpa

ipv4-mapped::ffff:a00:db00

/24 split into /31 · 128 subnets

close ×

#	network	host range	broadcast
1	10.0.219.0/31	10.0.219.0 – 10.0.219.1	10.0.219.1
2	10.0.219.2/31	10.0.219.2 – 10.0.219.3	10.0.219.3
3	10.0.219.4/31	10.0.219.4 – 10.0.219.5	10.0.219.5
4	10.0.219.6/31	10.0.219.6 – 10.0.219.7	10.0.219.7
5	10.0.219.8/31	10.0.219.8 – 10.0.219.9	10.0.219.9
6	10.0.219.10/31	10.0.219.10 – 10.0.219.11	10.0.219.11
7	10.0.219.12/31	10.0.219.12 – 10.0.219.13	10.0.219.13
8	10.0.219.14/31	10.0.219.14 – 10.0.219.15	10.0.219.15
9	10.0.219.16/31	10.0.219.16 – 10.0.219.17	10.0.219.17
10	10.0.219.18/31	10.0.219.18 – 10.0.219.19	10.0.219.19
11	10.0.219.20/31	10.0.219.20 – 10.0.219.21	10.0.219.21
12	10.0.219.22/31	10.0.219.22 – 10.0.219.23	10.0.219.23
13	10.0.219.24/31	10.0.219.24 – 10.0.219.25	10.0.219.25
14	10.0.219.26/31	10.0.219.26 – 10.0.219.27	10.0.219.27
15	10.0.219.28/31	10.0.219.28 – 10.0.219.29	10.0.219.29
16	10.0.219.30/31	10.0.219.30 – 10.0.219.31	10.0.219.31
17	10.0.219.32/31	10.0.219.32 – 10.0.219.33	10.0.219.33
18	10.0.219.34/31	10.0.219.34 – 10.0.219.35	10.0.219.35
19	10.0.219.36/31	10.0.219.36 – 10.0.219.37	10.0.219.37
20	10.0.219.38/31	10.0.219.38 – 10.0.219.39	10.0.219.39
21	10.0.219.40/31	10.0.219.40 – 10.0.219.41	10.0.219.41
22	10.0.219.42/31	10.0.219.42 – 10.0.219.43	10.0.219.43
23	10.0.219.44/31	10.0.219.44 – 10.0.219.45	10.0.219.45
24	10.0.219.46/31	10.0.219.46 – 10.0.219.47	10.0.219.47
25	10.0.219.48/31	10.0.219.48 – 10.0.219.49	10.0.219.49
26	10.0.219.50/31	10.0.219.50 – 10.0.219.51	10.0.219.51
27	10.0.219.52/31	10.0.219.52 – 10.0.219.53	10.0.219.53
28	10.0.219.54/31	10.0.219.54 – 10.0.219.55	10.0.219.55
29	10.0.219.56/31	10.0.219.56 – 10.0.219.57	10.0.219.57
30	10.0.219.58/31	10.0.219.58 – 10.0.219.59	10.0.219.59
31	10.0.219.60/31	10.0.219.60 – 10.0.219.61	10.0.219.61
32	10.0.219.62/31	10.0.219.62 – 10.0.219.63	10.0.219.63
33	10.0.219.64/31	10.0.219.64 – 10.0.219.65	10.0.219.65
34	10.0.219.66/31	10.0.219.66 – 10.0.219.67	10.0.219.67
35	10.0.219.68/31	10.0.219.68 – 10.0.219.69	10.0.219.69
36	10.0.219.70/31	10.0.219.70 – 10.0.219.71	10.0.219.71
37	10.0.219.72/31	10.0.219.72 – 10.0.219.73	10.0.219.73
38	10.0.219.74/31	10.0.219.74 – 10.0.219.75	10.0.219.75
39	10.0.219.76/31	10.0.219.76 – 10.0.219.77	10.0.219.77
40	10.0.219.78/31	10.0.219.78 – 10.0.219.79	10.0.219.79
41	10.0.219.80/31	10.0.219.80 – 10.0.219.81	10.0.219.81
42	10.0.219.82/31	10.0.219.82 – 10.0.219.83	10.0.219.83
43	10.0.219.84/31	10.0.219.84 – 10.0.219.85	10.0.219.85
44	10.0.219.86/31	10.0.219.86 – 10.0.219.87	10.0.219.87
45	10.0.219.88/31	10.0.219.88 – 10.0.219.89	10.0.219.89
46	10.0.219.90/31	10.0.219.90 – 10.0.219.91	10.0.219.91
47	10.0.219.92/31	10.0.219.92 – 10.0.219.93	10.0.219.93
48	10.0.219.94/31	10.0.219.94 – 10.0.219.95	10.0.219.95
49	10.0.219.96/31	10.0.219.96 – 10.0.219.97	10.0.219.97
50	10.0.219.98/31	10.0.219.98 – 10.0.219.99	10.0.219.99
51	10.0.219.100/31	10.0.219.100 – 10.0.219.101	10.0.219.101
52	10.0.219.102/31	10.0.219.102 – 10.0.219.103	10.0.219.103
53	10.0.219.104/31	10.0.219.104 – 10.0.219.105	10.0.219.105
54	10.0.219.106/31	10.0.219.106 – 10.0.219.107	10.0.219.107
55	10.0.219.108/31	10.0.219.108 – 10.0.219.109	10.0.219.109
56	10.0.219.110/31	10.0.219.110 – 10.0.219.111	10.0.219.111
57	10.0.219.112/31	10.0.219.112 – 10.0.219.113	10.0.219.113
58	10.0.219.114/31	10.0.219.114 – 10.0.219.115	10.0.219.115
59	10.0.219.116/31	10.0.219.116 – 10.0.219.117	10.0.219.117
60	10.0.219.118/31	10.0.219.118 – 10.0.219.119	10.0.219.119
61	10.0.219.120/31	10.0.219.120 – 10.0.219.121	10.0.219.121
62	10.0.219.122/31	10.0.219.122 – 10.0.219.123	10.0.219.123
63	10.0.219.124/31	10.0.219.124 – 10.0.219.125	10.0.219.125
64	10.0.219.126/31	10.0.219.126 – 10.0.219.127	10.0.219.127
65	10.0.219.128/31	10.0.219.128 – 10.0.219.129	10.0.219.129
66	10.0.219.130/31	10.0.219.130 – 10.0.219.131	10.0.219.131
67	10.0.219.132/31	10.0.219.132 – 10.0.219.133	10.0.219.133
68	10.0.219.134/31	10.0.219.134 – 10.0.219.135	10.0.219.135
69	10.0.219.136/31	10.0.219.136 – 10.0.219.137	10.0.219.137
70	10.0.219.138/31	10.0.219.138 – 10.0.219.139	10.0.219.139
71	10.0.219.140/31	10.0.219.140 – 10.0.219.141	10.0.219.141
72	10.0.219.142/31	10.0.219.142 – 10.0.219.143	10.0.219.143
73	10.0.219.144/31	10.0.219.144 – 10.0.219.145	10.0.219.145
74	10.0.219.146/31	10.0.219.146 – 10.0.219.147	10.0.219.147
75	10.0.219.148/31	10.0.219.148 – 10.0.219.149	10.0.219.149
76	10.0.219.150/31	10.0.219.150 – 10.0.219.151	10.0.219.151
77	10.0.219.152/31	10.0.219.152 – 10.0.219.153	10.0.219.153
78	10.0.219.154/31	10.0.219.154 – 10.0.219.155	10.0.219.155
79	10.0.219.156/31	10.0.219.156 – 10.0.219.157	10.0.219.157
80	10.0.219.158/31	10.0.219.158 – 10.0.219.159	10.0.219.159
81	10.0.219.160/31	10.0.219.160 – 10.0.219.161	10.0.219.161
82	10.0.219.162/31	10.0.219.162 – 10.0.219.163	10.0.219.163
83	10.0.219.164/31	10.0.219.164 – 10.0.219.165	10.0.219.165
84	10.0.219.166/31	10.0.219.166 – 10.0.219.167	10.0.219.167
85	10.0.219.168/31	10.0.219.168 – 10.0.219.169	10.0.219.169
86	10.0.219.170/31	10.0.219.170 – 10.0.219.171	10.0.219.171
87	10.0.219.172/31	10.0.219.172 – 10.0.219.173	10.0.219.173
88	10.0.219.174/31	10.0.219.174 – 10.0.219.175	10.0.219.175
89	10.0.219.176/31	10.0.219.176 – 10.0.219.177	10.0.219.177
90	10.0.219.178/31	10.0.219.178 – 10.0.219.179	10.0.219.179
91	10.0.219.180/31	10.0.219.180 – 10.0.219.181	10.0.219.181
92	10.0.219.182/31	10.0.219.182 – 10.0.219.183	10.0.219.183
93	10.0.219.184/31	10.0.219.184 – 10.0.219.185	10.0.219.185
94	10.0.219.186/31	10.0.219.186 – 10.0.219.187	10.0.219.187
95	10.0.219.188/31	10.0.219.188 – 10.0.219.189	10.0.219.189
96	10.0.219.190/31	10.0.219.190 – 10.0.219.191	10.0.219.191
97	10.0.219.192/31	10.0.219.192 – 10.0.219.193	10.0.219.193
98	10.0.219.194/31	10.0.219.194 – 10.0.219.195	10.0.219.195
99	10.0.219.196/31	10.0.219.196 – 10.0.219.197	10.0.219.197
100	10.0.219.198/31	10.0.219.198 – 10.0.219.199	10.0.219.199
101	10.0.219.200/31	10.0.219.200 – 10.0.219.201	10.0.219.201
102	10.0.219.202/31	10.0.219.202 – 10.0.219.203	10.0.219.203
103	10.0.219.204/31	10.0.219.204 – 10.0.219.205	10.0.219.205
104	10.0.219.206/31	10.0.219.206 – 10.0.219.207	10.0.219.207
105	10.0.219.208/31	10.0.219.208 – 10.0.219.209	10.0.219.209
106	10.0.219.210/31	10.0.219.210 – 10.0.219.211	10.0.219.211
107	10.0.219.212/31	10.0.219.212 – 10.0.219.213	10.0.219.213
108	10.0.219.214/31	10.0.219.214 – 10.0.219.215	10.0.219.215
109	10.0.219.216/31	10.0.219.216 – 10.0.219.217	10.0.219.217
110	10.0.219.218/31	10.0.219.218 – 10.0.219.219	10.0.219.219
111	10.0.219.220/31	10.0.219.220 – 10.0.219.221	10.0.219.221
112	10.0.219.222/31	10.0.219.222 – 10.0.219.223	10.0.219.223
113	10.0.219.224/31	10.0.219.224 – 10.0.219.225	10.0.219.225
114	10.0.219.226/31	10.0.219.226 – 10.0.219.227	10.0.219.227
115	10.0.219.228/31	10.0.219.228 – 10.0.219.229	10.0.219.229
116	10.0.219.230/31	10.0.219.230 – 10.0.219.231	10.0.219.231
117	10.0.219.232/31	10.0.219.232 – 10.0.219.233	10.0.219.233
118	10.0.219.234/31	10.0.219.234 – 10.0.219.235	10.0.219.235
119	10.0.219.236/31	10.0.219.236 – 10.0.219.237	10.0.219.237
120	10.0.219.238/31	10.0.219.238 – 10.0.219.239	10.0.219.239
121	10.0.219.240/31	10.0.219.240 – 10.0.219.241	10.0.219.241
122	10.0.219.242/31	10.0.219.242 – 10.0.219.243	10.0.219.243
123	10.0.219.244/31	10.0.219.244 – 10.0.219.245	10.0.219.245
124	10.0.219.246/31	10.0.219.246 – 10.0.219.247	10.0.219.247
125	10.0.219.248/31	10.0.219.248 – 10.0.219.249	10.0.219.249
126	10.0.219.250/31	10.0.219.250 – 10.0.219.251	10.0.219.251
127	10.0.219.252/31	10.0.219.252 – 10.0.219.253	10.0.219.253
128	10.0.219.254/31	10.0.219.254 – 10.0.219.255	10.0.219.255

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 →