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)10.5.248.0/21

network10.5.248.0/21

broadcast10.5.255.255

first host10.5.248.1

last host10.5.255.254

subnet mask255.255.248.0

wildcard0.0.7.255

addresses2,048

usable hosts2,046

classA

ipcalc 10.5.248.0/21

address00001010.00000101.11111000.00000000

subnet mask11111111.11111111.11111000.00000000

network00001010.00000101.11111000.00000000

broadcast00001010.00000101.11111111.11111111

green = network part, grey = host part

hex0x0a05f800

decimal168163328

reverse dns0.248.5.10.in-addr.arpa

ipv4-mapped::ffff:a05:f800

/21 split into /31 · 1,024 subnets

close ×

#	network	host range	broadcast
1	10.5.248.0/31	10.5.248.0 – 10.5.248.1	10.5.248.1
2	10.5.248.2/31	10.5.248.2 – 10.5.248.3	10.5.248.3
3	10.5.248.4/31	10.5.248.4 – 10.5.248.5	10.5.248.5
4	10.5.248.6/31	10.5.248.6 – 10.5.248.7	10.5.248.7
5	10.5.248.8/31	10.5.248.8 – 10.5.248.9	10.5.248.9
6	10.5.248.10/31	10.5.248.10 – 10.5.248.11	10.5.248.11
7	10.5.248.12/31	10.5.248.12 – 10.5.248.13	10.5.248.13
8	10.5.248.14/31	10.5.248.14 – 10.5.248.15	10.5.248.15
9	10.5.248.16/31	10.5.248.16 – 10.5.248.17	10.5.248.17
10	10.5.248.18/31	10.5.248.18 – 10.5.248.19	10.5.248.19
11	10.5.248.20/31	10.5.248.20 – 10.5.248.21	10.5.248.21
12	10.5.248.22/31	10.5.248.22 – 10.5.248.23	10.5.248.23
13	10.5.248.24/31	10.5.248.24 – 10.5.248.25	10.5.248.25
14	10.5.248.26/31	10.5.248.26 – 10.5.248.27	10.5.248.27
15	10.5.248.28/31	10.5.248.28 – 10.5.248.29	10.5.248.29
16	10.5.248.30/31	10.5.248.30 – 10.5.248.31	10.5.248.31
17	10.5.248.32/31	10.5.248.32 – 10.5.248.33	10.5.248.33
18	10.5.248.34/31	10.5.248.34 – 10.5.248.35	10.5.248.35
19	10.5.248.36/31	10.5.248.36 – 10.5.248.37	10.5.248.37
20	10.5.248.38/31	10.5.248.38 – 10.5.248.39	10.5.248.39
21	10.5.248.40/31	10.5.248.40 – 10.5.248.41	10.5.248.41
22	10.5.248.42/31	10.5.248.42 – 10.5.248.43	10.5.248.43
23	10.5.248.44/31	10.5.248.44 – 10.5.248.45	10.5.248.45
24	10.5.248.46/31	10.5.248.46 – 10.5.248.47	10.5.248.47
25	10.5.248.48/31	10.5.248.48 – 10.5.248.49	10.5.248.49
26	10.5.248.50/31	10.5.248.50 – 10.5.248.51	10.5.248.51
27	10.5.248.52/31	10.5.248.52 – 10.5.248.53	10.5.248.53
28	10.5.248.54/31	10.5.248.54 – 10.5.248.55	10.5.248.55
29	10.5.248.56/31	10.5.248.56 – 10.5.248.57	10.5.248.57
30	10.5.248.58/31	10.5.248.58 – 10.5.248.59	10.5.248.59
31	10.5.248.60/31	10.5.248.60 – 10.5.248.61	10.5.248.61
32	10.5.248.62/31	10.5.248.62 – 10.5.248.63	10.5.248.63
33	10.5.248.64/31	10.5.248.64 – 10.5.248.65	10.5.248.65
34	10.5.248.66/31	10.5.248.66 – 10.5.248.67	10.5.248.67
35	10.5.248.68/31	10.5.248.68 – 10.5.248.69	10.5.248.69
36	10.5.248.70/31	10.5.248.70 – 10.5.248.71	10.5.248.71
37	10.5.248.72/31	10.5.248.72 – 10.5.248.73	10.5.248.73
38	10.5.248.74/31	10.5.248.74 – 10.5.248.75	10.5.248.75
39	10.5.248.76/31	10.5.248.76 – 10.5.248.77	10.5.248.77
40	10.5.248.78/31	10.5.248.78 – 10.5.248.79	10.5.248.79
41	10.5.248.80/31	10.5.248.80 – 10.5.248.81	10.5.248.81
42	10.5.248.82/31	10.5.248.82 – 10.5.248.83	10.5.248.83
43	10.5.248.84/31	10.5.248.84 – 10.5.248.85	10.5.248.85
44	10.5.248.86/31	10.5.248.86 – 10.5.248.87	10.5.248.87
45	10.5.248.88/31	10.5.248.88 – 10.5.248.89	10.5.248.89
46	10.5.248.90/31	10.5.248.90 – 10.5.248.91	10.5.248.91
47	10.5.248.92/31	10.5.248.92 – 10.5.248.93	10.5.248.93
48	10.5.248.94/31	10.5.248.94 – 10.5.248.95	10.5.248.95
49	10.5.248.96/31	10.5.248.96 – 10.5.248.97	10.5.248.97
50	10.5.248.98/31	10.5.248.98 – 10.5.248.99	10.5.248.99
51	10.5.248.100/31	10.5.248.100 – 10.5.248.101	10.5.248.101
52	10.5.248.102/31	10.5.248.102 – 10.5.248.103	10.5.248.103
53	10.5.248.104/31	10.5.248.104 – 10.5.248.105	10.5.248.105
54	10.5.248.106/31	10.5.248.106 – 10.5.248.107	10.5.248.107
55	10.5.248.108/31	10.5.248.108 – 10.5.248.109	10.5.248.109
56	10.5.248.110/31	10.5.248.110 – 10.5.248.111	10.5.248.111
57	10.5.248.112/31	10.5.248.112 – 10.5.248.113	10.5.248.113
58	10.5.248.114/31	10.5.248.114 – 10.5.248.115	10.5.248.115
59	10.5.248.116/31	10.5.248.116 – 10.5.248.117	10.5.248.117
60	10.5.248.118/31	10.5.248.118 – 10.5.248.119	10.5.248.119
61	10.5.248.120/31	10.5.248.120 – 10.5.248.121	10.5.248.121
62	10.5.248.122/31	10.5.248.122 – 10.5.248.123	10.5.248.123
63	10.5.248.124/31	10.5.248.124 – 10.5.248.125	10.5.248.125
64	10.5.248.126/31	10.5.248.126 – 10.5.248.127	10.5.248.127
65	10.5.248.128/31	10.5.248.128 – 10.5.248.129	10.5.248.129
66	10.5.248.130/31	10.5.248.130 – 10.5.248.131	10.5.248.131
67	10.5.248.132/31	10.5.248.132 – 10.5.248.133	10.5.248.133
68	10.5.248.134/31	10.5.248.134 – 10.5.248.135	10.5.248.135
69	10.5.248.136/31	10.5.248.136 – 10.5.248.137	10.5.248.137
70	10.5.248.138/31	10.5.248.138 – 10.5.248.139	10.5.248.139
71	10.5.248.140/31	10.5.248.140 – 10.5.248.141	10.5.248.141
72	10.5.248.142/31	10.5.248.142 – 10.5.248.143	10.5.248.143
73	10.5.248.144/31	10.5.248.144 – 10.5.248.145	10.5.248.145
74	10.5.248.146/31	10.5.248.146 – 10.5.248.147	10.5.248.147
75	10.5.248.148/31	10.5.248.148 – 10.5.248.149	10.5.248.149
76	10.5.248.150/31	10.5.248.150 – 10.5.248.151	10.5.248.151
77	10.5.248.152/31	10.5.248.152 – 10.5.248.153	10.5.248.153
78	10.5.248.154/31	10.5.248.154 – 10.5.248.155	10.5.248.155
79	10.5.248.156/31	10.5.248.156 – 10.5.248.157	10.5.248.157
80	10.5.248.158/31	10.5.248.158 – 10.5.248.159	10.5.248.159
81	10.5.248.160/31	10.5.248.160 – 10.5.248.161	10.5.248.161
82	10.5.248.162/31	10.5.248.162 – 10.5.248.163	10.5.248.163
83	10.5.248.164/31	10.5.248.164 – 10.5.248.165	10.5.248.165
84	10.5.248.166/31	10.5.248.166 – 10.5.248.167	10.5.248.167
85	10.5.248.168/31	10.5.248.168 – 10.5.248.169	10.5.248.169
86	10.5.248.170/31	10.5.248.170 – 10.5.248.171	10.5.248.171
87	10.5.248.172/31	10.5.248.172 – 10.5.248.173	10.5.248.173
88	10.5.248.174/31	10.5.248.174 – 10.5.248.175	10.5.248.175
89	10.5.248.176/31	10.5.248.176 – 10.5.248.177	10.5.248.177
90	10.5.248.178/31	10.5.248.178 – 10.5.248.179	10.5.248.179
91	10.5.248.180/31	10.5.248.180 – 10.5.248.181	10.5.248.181
92	10.5.248.182/31	10.5.248.182 – 10.5.248.183	10.5.248.183
93	10.5.248.184/31	10.5.248.184 – 10.5.248.185	10.5.248.185
94	10.5.248.186/31	10.5.248.186 – 10.5.248.187	10.5.248.187
95	10.5.248.188/31	10.5.248.188 – 10.5.248.189	10.5.248.189
96	10.5.248.190/31	10.5.248.190 – 10.5.248.191	10.5.248.191
97	10.5.248.192/31	10.5.248.192 – 10.5.248.193	10.5.248.193
98	10.5.248.194/31	10.5.248.194 – 10.5.248.195	10.5.248.195
99	10.5.248.196/31	10.5.248.196 – 10.5.248.197	10.5.248.197
100	10.5.248.198/31	10.5.248.198 – 10.5.248.199	10.5.248.199
101	10.5.248.200/31	10.5.248.200 – 10.5.248.201	10.5.248.201
102	10.5.248.202/31	10.5.248.202 – 10.5.248.203	10.5.248.203
103	10.5.248.204/31	10.5.248.204 – 10.5.248.205	10.5.248.205
104	10.5.248.206/31	10.5.248.206 – 10.5.248.207	10.5.248.207
105	10.5.248.208/31	10.5.248.208 – 10.5.248.209	10.5.248.209
106	10.5.248.210/31	10.5.248.210 – 10.5.248.211	10.5.248.211
107	10.5.248.212/31	10.5.248.212 – 10.5.248.213	10.5.248.213
108	10.5.248.214/31	10.5.248.214 – 10.5.248.215	10.5.248.215
109	10.5.248.216/31	10.5.248.216 – 10.5.248.217	10.5.248.217
110	10.5.248.218/31	10.5.248.218 – 10.5.248.219	10.5.248.219
111	10.5.248.220/31	10.5.248.220 – 10.5.248.221	10.5.248.221
112	10.5.248.222/31	10.5.248.222 – 10.5.248.223	10.5.248.223
113	10.5.248.224/31	10.5.248.224 – 10.5.248.225	10.5.248.225
114	10.5.248.226/31	10.5.248.226 – 10.5.248.227	10.5.248.227
115	10.5.248.228/31	10.5.248.228 – 10.5.248.229	10.5.248.229
116	10.5.248.230/31	10.5.248.230 – 10.5.248.231	10.5.248.231
117	10.5.248.232/31	10.5.248.232 – 10.5.248.233	10.5.248.233
118	10.5.248.234/31	10.5.248.234 – 10.5.248.235	10.5.248.235
119	10.5.248.236/31	10.5.248.236 – 10.5.248.237	10.5.248.237
120	10.5.248.238/31	10.5.248.238 – 10.5.248.239	10.5.248.239
121	10.5.248.240/31	10.5.248.240 – 10.5.248.241	10.5.248.241
122	10.5.248.242/31	10.5.248.242 – 10.5.248.243	10.5.248.243
123	10.5.248.244/31	10.5.248.244 – 10.5.248.245	10.5.248.245
124	10.5.248.246/31	10.5.248.246 – 10.5.248.247	10.5.248.247
125	10.5.248.248/31	10.5.248.248 – 10.5.248.249	10.5.248.249
126	10.5.248.250/31	10.5.248.250 – 10.5.248.251	10.5.248.251
127	10.5.248.252/31	10.5.248.252 – 10.5.248.253	10.5.248.253
128	10.5.248.254/31	10.5.248.254 – 10.5.248.255	10.5.248.255
129	10.5.249.0/31	10.5.249.0 – 10.5.249.1	10.5.249.1
130	10.5.249.2/31	10.5.249.2 – 10.5.249.3	10.5.249.3
131	10.5.249.4/31	10.5.249.4 – 10.5.249.5	10.5.249.5
132	10.5.249.6/31	10.5.249.6 – 10.5.249.7	10.5.249.7
133	10.5.249.8/31	10.5.249.8 – 10.5.249.9	10.5.249.9
134	10.5.249.10/31	10.5.249.10 – 10.5.249.11	10.5.249.11
135	10.5.249.12/31	10.5.249.12 – 10.5.249.13	10.5.249.13
136	10.5.249.14/31	10.5.249.14 – 10.5.249.15	10.5.249.15
137	10.5.249.16/31	10.5.249.16 – 10.5.249.17	10.5.249.17
138	10.5.249.18/31	10.5.249.18 – 10.5.249.19	10.5.249.19
139	10.5.249.20/31	10.5.249.20 – 10.5.249.21	10.5.249.21
140	10.5.249.22/31	10.5.249.22 – 10.5.249.23	10.5.249.23
141	10.5.249.24/31	10.5.249.24 – 10.5.249.25	10.5.249.25
142	10.5.249.26/31	10.5.249.26 – 10.5.249.27	10.5.249.27
143	10.5.249.28/31	10.5.249.28 – 10.5.249.29	10.5.249.29
144	10.5.249.30/31	10.5.249.30 – 10.5.249.31	10.5.249.31
145	10.5.249.32/31	10.5.249.32 – 10.5.249.33	10.5.249.33
146	10.5.249.34/31	10.5.249.34 – 10.5.249.35	10.5.249.35
147	10.5.249.36/31	10.5.249.36 – 10.5.249.37	10.5.249.37
148	10.5.249.38/31	10.5.249.38 – 10.5.249.39	10.5.249.39
149	10.5.249.40/31	10.5.249.40 – 10.5.249.41	10.5.249.41
150	10.5.249.42/31	10.5.249.42 – 10.5.249.43	10.5.249.43
151	10.5.249.44/31	10.5.249.44 – 10.5.249.45	10.5.249.45
152	10.5.249.46/31	10.5.249.46 – 10.5.249.47	10.5.249.47
153	10.5.249.48/31	10.5.249.48 – 10.5.249.49	10.5.249.49
154	10.5.249.50/31	10.5.249.50 – 10.5.249.51	10.5.249.51
155	10.5.249.52/31	10.5.249.52 – 10.5.249.53	10.5.249.53
156	10.5.249.54/31	10.5.249.54 – 10.5.249.55	10.5.249.55
157	10.5.249.56/31	10.5.249.56 – 10.5.249.57	10.5.249.57
158	10.5.249.58/31	10.5.249.58 – 10.5.249.59	10.5.249.59
159	10.5.249.60/31	10.5.249.60 – 10.5.249.61	10.5.249.61
160	10.5.249.62/31	10.5.249.62 – 10.5.249.63	10.5.249.63
161	10.5.249.64/31	10.5.249.64 – 10.5.249.65	10.5.249.65
162	10.5.249.66/31	10.5.249.66 – 10.5.249.67	10.5.249.67
163	10.5.249.68/31	10.5.249.68 – 10.5.249.69	10.5.249.69
164	10.5.249.70/31	10.5.249.70 – 10.5.249.71	10.5.249.71
165	10.5.249.72/31	10.5.249.72 – 10.5.249.73	10.5.249.73
166	10.5.249.74/31	10.5.249.74 – 10.5.249.75	10.5.249.75
167	10.5.249.76/31	10.5.249.76 – 10.5.249.77	10.5.249.77
168	10.5.249.78/31	10.5.249.78 – 10.5.249.79	10.5.249.79
169	10.5.249.80/31	10.5.249.80 – 10.5.249.81	10.5.249.81
170	10.5.249.82/31	10.5.249.82 – 10.5.249.83	10.5.249.83
171	10.5.249.84/31	10.5.249.84 – 10.5.249.85	10.5.249.85
172	10.5.249.86/31	10.5.249.86 – 10.5.249.87	10.5.249.87
173	10.5.249.88/31	10.5.249.88 – 10.5.249.89	10.5.249.89
174	10.5.249.90/31	10.5.249.90 – 10.5.249.91	10.5.249.91
175	10.5.249.92/31	10.5.249.92 – 10.5.249.93	10.5.249.93
176	10.5.249.94/31	10.5.249.94 – 10.5.249.95	10.5.249.95
177	10.5.249.96/31	10.5.249.96 – 10.5.249.97	10.5.249.97
178	10.5.249.98/31	10.5.249.98 – 10.5.249.99	10.5.249.99
179	10.5.249.100/31	10.5.249.100 – 10.5.249.101	10.5.249.101
180	10.5.249.102/31	10.5.249.102 – 10.5.249.103	10.5.249.103
181	10.5.249.104/31	10.5.249.104 – 10.5.249.105	10.5.249.105
182	10.5.249.106/31	10.5.249.106 – 10.5.249.107	10.5.249.107
183	10.5.249.108/31	10.5.249.108 – 10.5.249.109	10.5.249.109
184	10.5.249.110/31	10.5.249.110 – 10.5.249.111	10.5.249.111
185	10.5.249.112/31	10.5.249.112 – 10.5.249.113	10.5.249.113
186	10.5.249.114/31	10.5.249.114 – 10.5.249.115	10.5.249.115
187	10.5.249.116/31	10.5.249.116 – 10.5.249.117	10.5.249.117
188	10.5.249.118/31	10.5.249.118 – 10.5.249.119	10.5.249.119
189	10.5.249.120/31	10.5.249.120 – 10.5.249.121	10.5.249.121
190	10.5.249.122/31	10.5.249.122 – 10.5.249.123	10.5.249.123
191	10.5.249.124/31	10.5.249.124 – 10.5.249.125	10.5.249.125
192	10.5.249.126/31	10.5.249.126 – 10.5.249.127	10.5.249.127
193	10.5.249.128/31	10.5.249.128 – 10.5.249.129	10.5.249.129
194	10.5.249.130/31	10.5.249.130 – 10.5.249.131	10.5.249.131
195	10.5.249.132/31	10.5.249.132 – 10.5.249.133	10.5.249.133
196	10.5.249.134/31	10.5.249.134 – 10.5.249.135	10.5.249.135
197	10.5.249.136/31	10.5.249.136 – 10.5.249.137	10.5.249.137
198	10.5.249.138/31	10.5.249.138 – 10.5.249.139	10.5.249.139
199	10.5.249.140/31	10.5.249.140 – 10.5.249.141	10.5.249.141
200	10.5.249.142/31	10.5.249.142 – 10.5.249.143	10.5.249.143
201	10.5.249.144/31	10.5.249.144 – 10.5.249.145	10.5.249.145
202	10.5.249.146/31	10.5.249.146 – 10.5.249.147	10.5.249.147
203	10.5.249.148/31	10.5.249.148 – 10.5.249.149	10.5.249.149
204	10.5.249.150/31	10.5.249.150 – 10.5.249.151	10.5.249.151
205	10.5.249.152/31	10.5.249.152 – 10.5.249.153	10.5.249.153
206	10.5.249.154/31	10.5.249.154 – 10.5.249.155	10.5.249.155
207	10.5.249.156/31	10.5.249.156 – 10.5.249.157	10.5.249.157
208	10.5.249.158/31	10.5.249.158 – 10.5.249.159	10.5.249.159
209	10.5.249.160/31	10.5.249.160 – 10.5.249.161	10.5.249.161
210	10.5.249.162/31	10.5.249.162 – 10.5.249.163	10.5.249.163
211	10.5.249.164/31	10.5.249.164 – 10.5.249.165	10.5.249.165
212	10.5.249.166/31	10.5.249.166 – 10.5.249.167	10.5.249.167
213	10.5.249.168/31	10.5.249.168 – 10.5.249.169	10.5.249.169
214	10.5.249.170/31	10.5.249.170 – 10.5.249.171	10.5.249.171
215	10.5.249.172/31	10.5.249.172 – 10.5.249.173	10.5.249.173
216	10.5.249.174/31	10.5.249.174 – 10.5.249.175	10.5.249.175
217	10.5.249.176/31	10.5.249.176 – 10.5.249.177	10.5.249.177
218	10.5.249.178/31	10.5.249.178 – 10.5.249.179	10.5.249.179
219	10.5.249.180/31	10.5.249.180 – 10.5.249.181	10.5.249.181
220	10.5.249.182/31	10.5.249.182 – 10.5.249.183	10.5.249.183
221	10.5.249.184/31	10.5.249.184 – 10.5.249.185	10.5.249.185
222	10.5.249.186/31	10.5.249.186 – 10.5.249.187	10.5.249.187
223	10.5.249.188/31	10.5.249.188 – 10.5.249.189	10.5.249.189
224	10.5.249.190/31	10.5.249.190 – 10.5.249.191	10.5.249.191
225	10.5.249.192/31	10.5.249.192 – 10.5.249.193	10.5.249.193
226	10.5.249.194/31	10.5.249.194 – 10.5.249.195	10.5.249.195
227	10.5.249.196/31	10.5.249.196 – 10.5.249.197	10.5.249.197
228	10.5.249.198/31	10.5.249.198 – 10.5.249.199	10.5.249.199
229	10.5.249.200/31	10.5.249.200 – 10.5.249.201	10.5.249.201
230	10.5.249.202/31	10.5.249.202 – 10.5.249.203	10.5.249.203
231	10.5.249.204/31	10.5.249.204 – 10.5.249.205	10.5.249.205
232	10.5.249.206/31	10.5.249.206 – 10.5.249.207	10.5.249.207
233	10.5.249.208/31	10.5.249.208 – 10.5.249.209	10.5.249.209
234	10.5.249.210/31	10.5.249.210 – 10.5.249.211	10.5.249.211
235	10.5.249.212/31	10.5.249.212 – 10.5.249.213	10.5.249.213
236	10.5.249.214/31	10.5.249.214 – 10.5.249.215	10.5.249.215
237	10.5.249.216/31	10.5.249.216 – 10.5.249.217	10.5.249.217
238	10.5.249.218/31	10.5.249.218 – 10.5.249.219	10.5.249.219
239	10.5.249.220/31	10.5.249.220 – 10.5.249.221	10.5.249.221
240	10.5.249.222/31	10.5.249.222 – 10.5.249.223	10.5.249.223
241	10.5.249.224/31	10.5.249.224 – 10.5.249.225	10.5.249.225
242	10.5.249.226/31	10.5.249.226 – 10.5.249.227	10.5.249.227
243	10.5.249.228/31	10.5.249.228 – 10.5.249.229	10.5.249.229
244	10.5.249.230/31	10.5.249.230 – 10.5.249.231	10.5.249.231
245	10.5.249.232/31	10.5.249.232 – 10.5.249.233	10.5.249.233
246	10.5.249.234/31	10.5.249.234 – 10.5.249.235	10.5.249.235
247	10.5.249.236/31	10.5.249.236 – 10.5.249.237	10.5.249.237
248	10.5.249.238/31	10.5.249.238 – 10.5.249.239	10.5.249.239
249	10.5.249.240/31	10.5.249.240 – 10.5.249.241	10.5.249.241
250	10.5.249.242/31	10.5.249.242 – 10.5.249.243	10.5.249.243
251	10.5.249.244/31	10.5.249.244 – 10.5.249.245	10.5.249.245
252	10.5.249.246/31	10.5.249.246 – 10.5.249.247	10.5.249.247
253	10.5.249.248/31	10.5.249.248 – 10.5.249.249	10.5.249.249
254	10.5.249.250/31	10.5.249.250 – 10.5.249.251	10.5.249.251
255	10.5.249.252/31	10.5.249.252 – 10.5.249.253	10.5.249.253
256	10.5.249.254/31	10.5.249.254 – 10.5.249.255	10.5.249.255

showing 256 of 1,024

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 /21
/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	1
/22	255.255.252.0	1,024	1,022	2 split →
/23	255.255.254.0	512	510	4 split →
/24	255.255.255.0	256	254	8 split →
/25	255.255.255.128	128	126	16 split →
/26	255.255.255.192	64	62	32 split →
/27	255.255.255.224	32	30	64 split →
/28	255.255.255.240	16	14	128 split →
/29	255.255.255.248	8	6	256 split →
/30	255.255.255.252	4	2	512 split →
/31	255.255.255.254	2	2	1,024 split →
/32	255.255.255.255	1	1	2,048 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 →