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)10.0.30.0/23

network10.0.30.0/23

broadcast10.0.31.255

first host10.0.30.1

last host10.0.31.254

subnet mask255.255.254.0

wildcard0.0.1.255

addresses512

usable hosts510

classA

ipcalc 10.0.30.0/23

address00001010.00000000.00011110.00000000

subnet mask11111111.11111111.11111110.00000000

network00001010.00000000.00011110.00000000

broadcast00001010.00000000.00011111.11111111

green = network part, grey = host part

hex0x0a001e00

decimal167779840

reverse dns0.30.0.10.in-addr.arpa

ipv4-mapped::ffff:a00:1e00

/23 split into /31 · 256 subnets

close ×

#	network	host range	broadcast
1	10.0.30.0/31	10.0.30.0 – 10.0.30.1	10.0.30.1
2	10.0.30.2/31	10.0.30.2 – 10.0.30.3	10.0.30.3
3	10.0.30.4/31	10.0.30.4 – 10.0.30.5	10.0.30.5
4	10.0.30.6/31	10.0.30.6 – 10.0.30.7	10.0.30.7
5	10.0.30.8/31	10.0.30.8 – 10.0.30.9	10.0.30.9
6	10.0.30.10/31	10.0.30.10 – 10.0.30.11	10.0.30.11
7	10.0.30.12/31	10.0.30.12 – 10.0.30.13	10.0.30.13
8	10.0.30.14/31	10.0.30.14 – 10.0.30.15	10.0.30.15
9	10.0.30.16/31	10.0.30.16 – 10.0.30.17	10.0.30.17
10	10.0.30.18/31	10.0.30.18 – 10.0.30.19	10.0.30.19
11	10.0.30.20/31	10.0.30.20 – 10.0.30.21	10.0.30.21
12	10.0.30.22/31	10.0.30.22 – 10.0.30.23	10.0.30.23
13	10.0.30.24/31	10.0.30.24 – 10.0.30.25	10.0.30.25
14	10.0.30.26/31	10.0.30.26 – 10.0.30.27	10.0.30.27
15	10.0.30.28/31	10.0.30.28 – 10.0.30.29	10.0.30.29
16	10.0.30.30/31	10.0.30.30 – 10.0.30.31	10.0.30.31
17	10.0.30.32/31	10.0.30.32 – 10.0.30.33	10.0.30.33
18	10.0.30.34/31	10.0.30.34 – 10.0.30.35	10.0.30.35
19	10.0.30.36/31	10.0.30.36 – 10.0.30.37	10.0.30.37
20	10.0.30.38/31	10.0.30.38 – 10.0.30.39	10.0.30.39
21	10.0.30.40/31	10.0.30.40 – 10.0.30.41	10.0.30.41
22	10.0.30.42/31	10.0.30.42 – 10.0.30.43	10.0.30.43
23	10.0.30.44/31	10.0.30.44 – 10.0.30.45	10.0.30.45
24	10.0.30.46/31	10.0.30.46 – 10.0.30.47	10.0.30.47
25	10.0.30.48/31	10.0.30.48 – 10.0.30.49	10.0.30.49
26	10.0.30.50/31	10.0.30.50 – 10.0.30.51	10.0.30.51
27	10.0.30.52/31	10.0.30.52 – 10.0.30.53	10.0.30.53
28	10.0.30.54/31	10.0.30.54 – 10.0.30.55	10.0.30.55
29	10.0.30.56/31	10.0.30.56 – 10.0.30.57	10.0.30.57
30	10.0.30.58/31	10.0.30.58 – 10.0.30.59	10.0.30.59
31	10.0.30.60/31	10.0.30.60 – 10.0.30.61	10.0.30.61
32	10.0.30.62/31	10.0.30.62 – 10.0.30.63	10.0.30.63
33	10.0.30.64/31	10.0.30.64 – 10.0.30.65	10.0.30.65
34	10.0.30.66/31	10.0.30.66 – 10.0.30.67	10.0.30.67
35	10.0.30.68/31	10.0.30.68 – 10.0.30.69	10.0.30.69
36	10.0.30.70/31	10.0.30.70 – 10.0.30.71	10.0.30.71
37	10.0.30.72/31	10.0.30.72 – 10.0.30.73	10.0.30.73
38	10.0.30.74/31	10.0.30.74 – 10.0.30.75	10.0.30.75
39	10.0.30.76/31	10.0.30.76 – 10.0.30.77	10.0.30.77
40	10.0.30.78/31	10.0.30.78 – 10.0.30.79	10.0.30.79
41	10.0.30.80/31	10.0.30.80 – 10.0.30.81	10.0.30.81
42	10.0.30.82/31	10.0.30.82 – 10.0.30.83	10.0.30.83
43	10.0.30.84/31	10.0.30.84 – 10.0.30.85	10.0.30.85
44	10.0.30.86/31	10.0.30.86 – 10.0.30.87	10.0.30.87
45	10.0.30.88/31	10.0.30.88 – 10.0.30.89	10.0.30.89
46	10.0.30.90/31	10.0.30.90 – 10.0.30.91	10.0.30.91
47	10.0.30.92/31	10.0.30.92 – 10.0.30.93	10.0.30.93
48	10.0.30.94/31	10.0.30.94 – 10.0.30.95	10.0.30.95
49	10.0.30.96/31	10.0.30.96 – 10.0.30.97	10.0.30.97
50	10.0.30.98/31	10.0.30.98 – 10.0.30.99	10.0.30.99
51	10.0.30.100/31	10.0.30.100 – 10.0.30.101	10.0.30.101
52	10.0.30.102/31	10.0.30.102 – 10.0.30.103	10.0.30.103
53	10.0.30.104/31	10.0.30.104 – 10.0.30.105	10.0.30.105
54	10.0.30.106/31	10.0.30.106 – 10.0.30.107	10.0.30.107
55	10.0.30.108/31	10.0.30.108 – 10.0.30.109	10.0.30.109
56	10.0.30.110/31	10.0.30.110 – 10.0.30.111	10.0.30.111
57	10.0.30.112/31	10.0.30.112 – 10.0.30.113	10.0.30.113
58	10.0.30.114/31	10.0.30.114 – 10.0.30.115	10.0.30.115
59	10.0.30.116/31	10.0.30.116 – 10.0.30.117	10.0.30.117
60	10.0.30.118/31	10.0.30.118 – 10.0.30.119	10.0.30.119
61	10.0.30.120/31	10.0.30.120 – 10.0.30.121	10.0.30.121
62	10.0.30.122/31	10.0.30.122 – 10.0.30.123	10.0.30.123
63	10.0.30.124/31	10.0.30.124 – 10.0.30.125	10.0.30.125
64	10.0.30.126/31	10.0.30.126 – 10.0.30.127	10.0.30.127
65	10.0.30.128/31	10.0.30.128 – 10.0.30.129	10.0.30.129
66	10.0.30.130/31	10.0.30.130 – 10.0.30.131	10.0.30.131
67	10.0.30.132/31	10.0.30.132 – 10.0.30.133	10.0.30.133
68	10.0.30.134/31	10.0.30.134 – 10.0.30.135	10.0.30.135
69	10.0.30.136/31	10.0.30.136 – 10.0.30.137	10.0.30.137
70	10.0.30.138/31	10.0.30.138 – 10.0.30.139	10.0.30.139
71	10.0.30.140/31	10.0.30.140 – 10.0.30.141	10.0.30.141
72	10.0.30.142/31	10.0.30.142 – 10.0.30.143	10.0.30.143
73	10.0.30.144/31	10.0.30.144 – 10.0.30.145	10.0.30.145
74	10.0.30.146/31	10.0.30.146 – 10.0.30.147	10.0.30.147
75	10.0.30.148/31	10.0.30.148 – 10.0.30.149	10.0.30.149
76	10.0.30.150/31	10.0.30.150 – 10.0.30.151	10.0.30.151
77	10.0.30.152/31	10.0.30.152 – 10.0.30.153	10.0.30.153
78	10.0.30.154/31	10.0.30.154 – 10.0.30.155	10.0.30.155
79	10.0.30.156/31	10.0.30.156 – 10.0.30.157	10.0.30.157
80	10.0.30.158/31	10.0.30.158 – 10.0.30.159	10.0.30.159
81	10.0.30.160/31	10.0.30.160 – 10.0.30.161	10.0.30.161
82	10.0.30.162/31	10.0.30.162 – 10.0.30.163	10.0.30.163
83	10.0.30.164/31	10.0.30.164 – 10.0.30.165	10.0.30.165
84	10.0.30.166/31	10.0.30.166 – 10.0.30.167	10.0.30.167
85	10.0.30.168/31	10.0.30.168 – 10.0.30.169	10.0.30.169
86	10.0.30.170/31	10.0.30.170 – 10.0.30.171	10.0.30.171
87	10.0.30.172/31	10.0.30.172 – 10.0.30.173	10.0.30.173
88	10.0.30.174/31	10.0.30.174 – 10.0.30.175	10.0.30.175
89	10.0.30.176/31	10.0.30.176 – 10.0.30.177	10.0.30.177
90	10.0.30.178/31	10.0.30.178 – 10.0.30.179	10.0.30.179
91	10.0.30.180/31	10.0.30.180 – 10.0.30.181	10.0.30.181
92	10.0.30.182/31	10.0.30.182 – 10.0.30.183	10.0.30.183
93	10.0.30.184/31	10.0.30.184 – 10.0.30.185	10.0.30.185
94	10.0.30.186/31	10.0.30.186 – 10.0.30.187	10.0.30.187
95	10.0.30.188/31	10.0.30.188 – 10.0.30.189	10.0.30.189
96	10.0.30.190/31	10.0.30.190 – 10.0.30.191	10.0.30.191
97	10.0.30.192/31	10.0.30.192 – 10.0.30.193	10.0.30.193
98	10.0.30.194/31	10.0.30.194 – 10.0.30.195	10.0.30.195
99	10.0.30.196/31	10.0.30.196 – 10.0.30.197	10.0.30.197
100	10.0.30.198/31	10.0.30.198 – 10.0.30.199	10.0.30.199
101	10.0.30.200/31	10.0.30.200 – 10.0.30.201	10.0.30.201
102	10.0.30.202/31	10.0.30.202 – 10.0.30.203	10.0.30.203
103	10.0.30.204/31	10.0.30.204 – 10.0.30.205	10.0.30.205
104	10.0.30.206/31	10.0.30.206 – 10.0.30.207	10.0.30.207
105	10.0.30.208/31	10.0.30.208 – 10.0.30.209	10.0.30.209
106	10.0.30.210/31	10.0.30.210 – 10.0.30.211	10.0.30.211
107	10.0.30.212/31	10.0.30.212 – 10.0.30.213	10.0.30.213
108	10.0.30.214/31	10.0.30.214 – 10.0.30.215	10.0.30.215
109	10.0.30.216/31	10.0.30.216 – 10.0.30.217	10.0.30.217
110	10.0.30.218/31	10.0.30.218 – 10.0.30.219	10.0.30.219
111	10.0.30.220/31	10.0.30.220 – 10.0.30.221	10.0.30.221
112	10.0.30.222/31	10.0.30.222 – 10.0.30.223	10.0.30.223
113	10.0.30.224/31	10.0.30.224 – 10.0.30.225	10.0.30.225
114	10.0.30.226/31	10.0.30.226 – 10.0.30.227	10.0.30.227
115	10.0.30.228/31	10.0.30.228 – 10.0.30.229	10.0.30.229
116	10.0.30.230/31	10.0.30.230 – 10.0.30.231	10.0.30.231
117	10.0.30.232/31	10.0.30.232 – 10.0.30.233	10.0.30.233
118	10.0.30.234/31	10.0.30.234 – 10.0.30.235	10.0.30.235
119	10.0.30.236/31	10.0.30.236 – 10.0.30.237	10.0.30.237
120	10.0.30.238/31	10.0.30.238 – 10.0.30.239	10.0.30.239
121	10.0.30.240/31	10.0.30.240 – 10.0.30.241	10.0.30.241
122	10.0.30.242/31	10.0.30.242 – 10.0.30.243	10.0.30.243
123	10.0.30.244/31	10.0.30.244 – 10.0.30.245	10.0.30.245
124	10.0.30.246/31	10.0.30.246 – 10.0.30.247	10.0.30.247
125	10.0.30.248/31	10.0.30.248 – 10.0.30.249	10.0.30.249
126	10.0.30.250/31	10.0.30.250 – 10.0.30.251	10.0.30.251
127	10.0.30.252/31	10.0.30.252 – 10.0.30.253	10.0.30.253
128	10.0.30.254/31	10.0.30.254 – 10.0.30.255	10.0.30.255
129	10.0.31.0/31	10.0.31.0 – 10.0.31.1	10.0.31.1
130	10.0.31.2/31	10.0.31.2 – 10.0.31.3	10.0.31.3
131	10.0.31.4/31	10.0.31.4 – 10.0.31.5	10.0.31.5
132	10.0.31.6/31	10.0.31.6 – 10.0.31.7	10.0.31.7
133	10.0.31.8/31	10.0.31.8 – 10.0.31.9	10.0.31.9
134	10.0.31.10/31	10.0.31.10 – 10.0.31.11	10.0.31.11
135	10.0.31.12/31	10.0.31.12 – 10.0.31.13	10.0.31.13
136	10.0.31.14/31	10.0.31.14 – 10.0.31.15	10.0.31.15
137	10.0.31.16/31	10.0.31.16 – 10.0.31.17	10.0.31.17
138	10.0.31.18/31	10.0.31.18 – 10.0.31.19	10.0.31.19
139	10.0.31.20/31	10.0.31.20 – 10.0.31.21	10.0.31.21
140	10.0.31.22/31	10.0.31.22 – 10.0.31.23	10.0.31.23
141	10.0.31.24/31	10.0.31.24 – 10.0.31.25	10.0.31.25
142	10.0.31.26/31	10.0.31.26 – 10.0.31.27	10.0.31.27
143	10.0.31.28/31	10.0.31.28 – 10.0.31.29	10.0.31.29
144	10.0.31.30/31	10.0.31.30 – 10.0.31.31	10.0.31.31
145	10.0.31.32/31	10.0.31.32 – 10.0.31.33	10.0.31.33
146	10.0.31.34/31	10.0.31.34 – 10.0.31.35	10.0.31.35
147	10.0.31.36/31	10.0.31.36 – 10.0.31.37	10.0.31.37
148	10.0.31.38/31	10.0.31.38 – 10.0.31.39	10.0.31.39
149	10.0.31.40/31	10.0.31.40 – 10.0.31.41	10.0.31.41
150	10.0.31.42/31	10.0.31.42 – 10.0.31.43	10.0.31.43
151	10.0.31.44/31	10.0.31.44 – 10.0.31.45	10.0.31.45
152	10.0.31.46/31	10.0.31.46 – 10.0.31.47	10.0.31.47
153	10.0.31.48/31	10.0.31.48 – 10.0.31.49	10.0.31.49
154	10.0.31.50/31	10.0.31.50 – 10.0.31.51	10.0.31.51
155	10.0.31.52/31	10.0.31.52 – 10.0.31.53	10.0.31.53
156	10.0.31.54/31	10.0.31.54 – 10.0.31.55	10.0.31.55
157	10.0.31.56/31	10.0.31.56 – 10.0.31.57	10.0.31.57
158	10.0.31.58/31	10.0.31.58 – 10.0.31.59	10.0.31.59
159	10.0.31.60/31	10.0.31.60 – 10.0.31.61	10.0.31.61
160	10.0.31.62/31	10.0.31.62 – 10.0.31.63	10.0.31.63
161	10.0.31.64/31	10.0.31.64 – 10.0.31.65	10.0.31.65
162	10.0.31.66/31	10.0.31.66 – 10.0.31.67	10.0.31.67
163	10.0.31.68/31	10.0.31.68 – 10.0.31.69	10.0.31.69
164	10.0.31.70/31	10.0.31.70 – 10.0.31.71	10.0.31.71
165	10.0.31.72/31	10.0.31.72 – 10.0.31.73	10.0.31.73
166	10.0.31.74/31	10.0.31.74 – 10.0.31.75	10.0.31.75
167	10.0.31.76/31	10.0.31.76 – 10.0.31.77	10.0.31.77
168	10.0.31.78/31	10.0.31.78 – 10.0.31.79	10.0.31.79
169	10.0.31.80/31	10.0.31.80 – 10.0.31.81	10.0.31.81
170	10.0.31.82/31	10.0.31.82 – 10.0.31.83	10.0.31.83
171	10.0.31.84/31	10.0.31.84 – 10.0.31.85	10.0.31.85
172	10.0.31.86/31	10.0.31.86 – 10.0.31.87	10.0.31.87
173	10.0.31.88/31	10.0.31.88 – 10.0.31.89	10.0.31.89
174	10.0.31.90/31	10.0.31.90 – 10.0.31.91	10.0.31.91
175	10.0.31.92/31	10.0.31.92 – 10.0.31.93	10.0.31.93
176	10.0.31.94/31	10.0.31.94 – 10.0.31.95	10.0.31.95
177	10.0.31.96/31	10.0.31.96 – 10.0.31.97	10.0.31.97
178	10.0.31.98/31	10.0.31.98 – 10.0.31.99	10.0.31.99
179	10.0.31.100/31	10.0.31.100 – 10.0.31.101	10.0.31.101
180	10.0.31.102/31	10.0.31.102 – 10.0.31.103	10.0.31.103
181	10.0.31.104/31	10.0.31.104 – 10.0.31.105	10.0.31.105
182	10.0.31.106/31	10.0.31.106 – 10.0.31.107	10.0.31.107
183	10.0.31.108/31	10.0.31.108 – 10.0.31.109	10.0.31.109
184	10.0.31.110/31	10.0.31.110 – 10.0.31.111	10.0.31.111
185	10.0.31.112/31	10.0.31.112 – 10.0.31.113	10.0.31.113
186	10.0.31.114/31	10.0.31.114 – 10.0.31.115	10.0.31.115
187	10.0.31.116/31	10.0.31.116 – 10.0.31.117	10.0.31.117
188	10.0.31.118/31	10.0.31.118 – 10.0.31.119	10.0.31.119
189	10.0.31.120/31	10.0.31.120 – 10.0.31.121	10.0.31.121
190	10.0.31.122/31	10.0.31.122 – 10.0.31.123	10.0.31.123
191	10.0.31.124/31	10.0.31.124 – 10.0.31.125	10.0.31.125
192	10.0.31.126/31	10.0.31.126 – 10.0.31.127	10.0.31.127
193	10.0.31.128/31	10.0.31.128 – 10.0.31.129	10.0.31.129
194	10.0.31.130/31	10.0.31.130 – 10.0.31.131	10.0.31.131
195	10.0.31.132/31	10.0.31.132 – 10.0.31.133	10.0.31.133
196	10.0.31.134/31	10.0.31.134 – 10.0.31.135	10.0.31.135
197	10.0.31.136/31	10.0.31.136 – 10.0.31.137	10.0.31.137
198	10.0.31.138/31	10.0.31.138 – 10.0.31.139	10.0.31.139
199	10.0.31.140/31	10.0.31.140 – 10.0.31.141	10.0.31.141
200	10.0.31.142/31	10.0.31.142 – 10.0.31.143	10.0.31.143
201	10.0.31.144/31	10.0.31.144 – 10.0.31.145	10.0.31.145
202	10.0.31.146/31	10.0.31.146 – 10.0.31.147	10.0.31.147
203	10.0.31.148/31	10.0.31.148 – 10.0.31.149	10.0.31.149
204	10.0.31.150/31	10.0.31.150 – 10.0.31.151	10.0.31.151
205	10.0.31.152/31	10.0.31.152 – 10.0.31.153	10.0.31.153
206	10.0.31.154/31	10.0.31.154 – 10.0.31.155	10.0.31.155
207	10.0.31.156/31	10.0.31.156 – 10.0.31.157	10.0.31.157
208	10.0.31.158/31	10.0.31.158 – 10.0.31.159	10.0.31.159
209	10.0.31.160/31	10.0.31.160 – 10.0.31.161	10.0.31.161
210	10.0.31.162/31	10.0.31.162 – 10.0.31.163	10.0.31.163
211	10.0.31.164/31	10.0.31.164 – 10.0.31.165	10.0.31.165
212	10.0.31.166/31	10.0.31.166 – 10.0.31.167	10.0.31.167
213	10.0.31.168/31	10.0.31.168 – 10.0.31.169	10.0.31.169
214	10.0.31.170/31	10.0.31.170 – 10.0.31.171	10.0.31.171
215	10.0.31.172/31	10.0.31.172 – 10.0.31.173	10.0.31.173
216	10.0.31.174/31	10.0.31.174 – 10.0.31.175	10.0.31.175
217	10.0.31.176/31	10.0.31.176 – 10.0.31.177	10.0.31.177
218	10.0.31.178/31	10.0.31.178 – 10.0.31.179	10.0.31.179
219	10.0.31.180/31	10.0.31.180 – 10.0.31.181	10.0.31.181
220	10.0.31.182/31	10.0.31.182 – 10.0.31.183	10.0.31.183
221	10.0.31.184/31	10.0.31.184 – 10.0.31.185	10.0.31.185
222	10.0.31.186/31	10.0.31.186 – 10.0.31.187	10.0.31.187
223	10.0.31.188/31	10.0.31.188 – 10.0.31.189	10.0.31.189
224	10.0.31.190/31	10.0.31.190 – 10.0.31.191	10.0.31.191
225	10.0.31.192/31	10.0.31.192 – 10.0.31.193	10.0.31.193
226	10.0.31.194/31	10.0.31.194 – 10.0.31.195	10.0.31.195
227	10.0.31.196/31	10.0.31.196 – 10.0.31.197	10.0.31.197
228	10.0.31.198/31	10.0.31.198 – 10.0.31.199	10.0.31.199
229	10.0.31.200/31	10.0.31.200 – 10.0.31.201	10.0.31.201
230	10.0.31.202/31	10.0.31.202 – 10.0.31.203	10.0.31.203
231	10.0.31.204/31	10.0.31.204 – 10.0.31.205	10.0.31.205
232	10.0.31.206/31	10.0.31.206 – 10.0.31.207	10.0.31.207
233	10.0.31.208/31	10.0.31.208 – 10.0.31.209	10.0.31.209
234	10.0.31.210/31	10.0.31.210 – 10.0.31.211	10.0.31.211
235	10.0.31.212/31	10.0.31.212 – 10.0.31.213	10.0.31.213
236	10.0.31.214/31	10.0.31.214 – 10.0.31.215	10.0.31.215
237	10.0.31.216/31	10.0.31.216 – 10.0.31.217	10.0.31.217
238	10.0.31.218/31	10.0.31.218 – 10.0.31.219	10.0.31.219
239	10.0.31.220/31	10.0.31.220 – 10.0.31.221	10.0.31.221
240	10.0.31.222/31	10.0.31.222 – 10.0.31.223	10.0.31.223
241	10.0.31.224/31	10.0.31.224 – 10.0.31.225	10.0.31.225
242	10.0.31.226/31	10.0.31.226 – 10.0.31.227	10.0.31.227
243	10.0.31.228/31	10.0.31.228 – 10.0.31.229	10.0.31.229
244	10.0.31.230/31	10.0.31.230 – 10.0.31.231	10.0.31.231
245	10.0.31.232/31	10.0.31.232 – 10.0.31.233	10.0.31.233
246	10.0.31.234/31	10.0.31.234 – 10.0.31.235	10.0.31.235
247	10.0.31.236/31	10.0.31.236 – 10.0.31.237	10.0.31.237
248	10.0.31.238/31	10.0.31.238 – 10.0.31.239	10.0.31.239
249	10.0.31.240/31	10.0.31.240 – 10.0.31.241	10.0.31.241
250	10.0.31.242/31	10.0.31.242 – 10.0.31.243	10.0.31.243
251	10.0.31.244/31	10.0.31.244 – 10.0.31.245	10.0.31.245
252	10.0.31.246/31	10.0.31.246 – 10.0.31.247	10.0.31.247
253	10.0.31.248/31	10.0.31.248 – 10.0.31.249	10.0.31.249
254	10.0.31.250/31	10.0.31.250 – 10.0.31.251	10.0.31.251
255	10.0.31.252/31	10.0.31.252 – 10.0.31.253	10.0.31.253
256	10.0.31.254/31	10.0.31.254 – 10.0.31.255	10.0.31.255

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 →