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)10.2.48.0/21

network10.2.48.0/21

broadcast10.2.55.255

first host10.2.48.1

last host10.2.55.254

subnet mask255.255.248.0

wildcard0.0.7.255

addresses2,048

usable hosts2,046

classA

ipcalc 10.2.48.0/21

address00001010.00000010.00110000.00000000

subnet mask11111111.11111111.11111000.00000000

network00001010.00000010.00110000.00000000

broadcast00001010.00000010.00110111.11111111

green = network part, grey = host part

hex0x0a023000

decimal167915520

reverse dns0.48.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:3000

/21 split into /30 · 512 subnets

close ×

#	network	host range	broadcast
1	10.2.48.0/30	10.2.48.1 – 10.2.48.2	10.2.48.3
2	10.2.48.4/30	10.2.48.5 – 10.2.48.6	10.2.48.7
3	10.2.48.8/30	10.2.48.9 – 10.2.48.10	10.2.48.11
4	10.2.48.12/30	10.2.48.13 – 10.2.48.14	10.2.48.15
5	10.2.48.16/30	10.2.48.17 – 10.2.48.18	10.2.48.19
6	10.2.48.20/30	10.2.48.21 – 10.2.48.22	10.2.48.23
7	10.2.48.24/30	10.2.48.25 – 10.2.48.26	10.2.48.27
8	10.2.48.28/30	10.2.48.29 – 10.2.48.30	10.2.48.31
9	10.2.48.32/30	10.2.48.33 – 10.2.48.34	10.2.48.35
10	10.2.48.36/30	10.2.48.37 – 10.2.48.38	10.2.48.39
11	10.2.48.40/30	10.2.48.41 – 10.2.48.42	10.2.48.43
12	10.2.48.44/30	10.2.48.45 – 10.2.48.46	10.2.48.47
13	10.2.48.48/30	10.2.48.49 – 10.2.48.50	10.2.48.51
14	10.2.48.52/30	10.2.48.53 – 10.2.48.54	10.2.48.55
15	10.2.48.56/30	10.2.48.57 – 10.2.48.58	10.2.48.59
16	10.2.48.60/30	10.2.48.61 – 10.2.48.62	10.2.48.63
17	10.2.48.64/30	10.2.48.65 – 10.2.48.66	10.2.48.67
18	10.2.48.68/30	10.2.48.69 – 10.2.48.70	10.2.48.71
19	10.2.48.72/30	10.2.48.73 – 10.2.48.74	10.2.48.75
20	10.2.48.76/30	10.2.48.77 – 10.2.48.78	10.2.48.79
21	10.2.48.80/30	10.2.48.81 – 10.2.48.82	10.2.48.83
22	10.2.48.84/30	10.2.48.85 – 10.2.48.86	10.2.48.87
23	10.2.48.88/30	10.2.48.89 – 10.2.48.90	10.2.48.91
24	10.2.48.92/30	10.2.48.93 – 10.2.48.94	10.2.48.95
25	10.2.48.96/30	10.2.48.97 – 10.2.48.98	10.2.48.99
26	10.2.48.100/30	10.2.48.101 – 10.2.48.102	10.2.48.103
27	10.2.48.104/30	10.2.48.105 – 10.2.48.106	10.2.48.107
28	10.2.48.108/30	10.2.48.109 – 10.2.48.110	10.2.48.111
29	10.2.48.112/30	10.2.48.113 – 10.2.48.114	10.2.48.115
30	10.2.48.116/30	10.2.48.117 – 10.2.48.118	10.2.48.119
31	10.2.48.120/30	10.2.48.121 – 10.2.48.122	10.2.48.123
32	10.2.48.124/30	10.2.48.125 – 10.2.48.126	10.2.48.127
33	10.2.48.128/30	10.2.48.129 – 10.2.48.130	10.2.48.131
34	10.2.48.132/30	10.2.48.133 – 10.2.48.134	10.2.48.135
35	10.2.48.136/30	10.2.48.137 – 10.2.48.138	10.2.48.139
36	10.2.48.140/30	10.2.48.141 – 10.2.48.142	10.2.48.143
37	10.2.48.144/30	10.2.48.145 – 10.2.48.146	10.2.48.147
38	10.2.48.148/30	10.2.48.149 – 10.2.48.150	10.2.48.151
39	10.2.48.152/30	10.2.48.153 – 10.2.48.154	10.2.48.155
40	10.2.48.156/30	10.2.48.157 – 10.2.48.158	10.2.48.159
41	10.2.48.160/30	10.2.48.161 – 10.2.48.162	10.2.48.163
42	10.2.48.164/30	10.2.48.165 – 10.2.48.166	10.2.48.167
43	10.2.48.168/30	10.2.48.169 – 10.2.48.170	10.2.48.171
44	10.2.48.172/30	10.2.48.173 – 10.2.48.174	10.2.48.175
45	10.2.48.176/30	10.2.48.177 – 10.2.48.178	10.2.48.179
46	10.2.48.180/30	10.2.48.181 – 10.2.48.182	10.2.48.183
47	10.2.48.184/30	10.2.48.185 – 10.2.48.186	10.2.48.187
48	10.2.48.188/30	10.2.48.189 – 10.2.48.190	10.2.48.191
49	10.2.48.192/30	10.2.48.193 – 10.2.48.194	10.2.48.195
50	10.2.48.196/30	10.2.48.197 – 10.2.48.198	10.2.48.199
51	10.2.48.200/30	10.2.48.201 – 10.2.48.202	10.2.48.203
52	10.2.48.204/30	10.2.48.205 – 10.2.48.206	10.2.48.207
53	10.2.48.208/30	10.2.48.209 – 10.2.48.210	10.2.48.211
54	10.2.48.212/30	10.2.48.213 – 10.2.48.214	10.2.48.215
55	10.2.48.216/30	10.2.48.217 – 10.2.48.218	10.2.48.219
56	10.2.48.220/30	10.2.48.221 – 10.2.48.222	10.2.48.223
57	10.2.48.224/30	10.2.48.225 – 10.2.48.226	10.2.48.227
58	10.2.48.228/30	10.2.48.229 – 10.2.48.230	10.2.48.231
59	10.2.48.232/30	10.2.48.233 – 10.2.48.234	10.2.48.235
60	10.2.48.236/30	10.2.48.237 – 10.2.48.238	10.2.48.239
61	10.2.48.240/30	10.2.48.241 – 10.2.48.242	10.2.48.243
62	10.2.48.244/30	10.2.48.245 – 10.2.48.246	10.2.48.247
63	10.2.48.248/30	10.2.48.249 – 10.2.48.250	10.2.48.251
64	10.2.48.252/30	10.2.48.253 – 10.2.48.254	10.2.48.255
65	10.2.49.0/30	10.2.49.1 – 10.2.49.2	10.2.49.3
66	10.2.49.4/30	10.2.49.5 – 10.2.49.6	10.2.49.7
67	10.2.49.8/30	10.2.49.9 – 10.2.49.10	10.2.49.11
68	10.2.49.12/30	10.2.49.13 – 10.2.49.14	10.2.49.15
69	10.2.49.16/30	10.2.49.17 – 10.2.49.18	10.2.49.19
70	10.2.49.20/30	10.2.49.21 – 10.2.49.22	10.2.49.23
71	10.2.49.24/30	10.2.49.25 – 10.2.49.26	10.2.49.27
72	10.2.49.28/30	10.2.49.29 – 10.2.49.30	10.2.49.31
73	10.2.49.32/30	10.2.49.33 – 10.2.49.34	10.2.49.35
74	10.2.49.36/30	10.2.49.37 – 10.2.49.38	10.2.49.39
75	10.2.49.40/30	10.2.49.41 – 10.2.49.42	10.2.49.43
76	10.2.49.44/30	10.2.49.45 – 10.2.49.46	10.2.49.47
77	10.2.49.48/30	10.2.49.49 – 10.2.49.50	10.2.49.51
78	10.2.49.52/30	10.2.49.53 – 10.2.49.54	10.2.49.55
79	10.2.49.56/30	10.2.49.57 – 10.2.49.58	10.2.49.59
80	10.2.49.60/30	10.2.49.61 – 10.2.49.62	10.2.49.63
81	10.2.49.64/30	10.2.49.65 – 10.2.49.66	10.2.49.67
82	10.2.49.68/30	10.2.49.69 – 10.2.49.70	10.2.49.71
83	10.2.49.72/30	10.2.49.73 – 10.2.49.74	10.2.49.75
84	10.2.49.76/30	10.2.49.77 – 10.2.49.78	10.2.49.79
85	10.2.49.80/30	10.2.49.81 – 10.2.49.82	10.2.49.83
86	10.2.49.84/30	10.2.49.85 – 10.2.49.86	10.2.49.87
87	10.2.49.88/30	10.2.49.89 – 10.2.49.90	10.2.49.91
88	10.2.49.92/30	10.2.49.93 – 10.2.49.94	10.2.49.95
89	10.2.49.96/30	10.2.49.97 – 10.2.49.98	10.2.49.99
90	10.2.49.100/30	10.2.49.101 – 10.2.49.102	10.2.49.103
91	10.2.49.104/30	10.2.49.105 – 10.2.49.106	10.2.49.107
92	10.2.49.108/30	10.2.49.109 – 10.2.49.110	10.2.49.111
93	10.2.49.112/30	10.2.49.113 – 10.2.49.114	10.2.49.115
94	10.2.49.116/30	10.2.49.117 – 10.2.49.118	10.2.49.119
95	10.2.49.120/30	10.2.49.121 – 10.2.49.122	10.2.49.123
96	10.2.49.124/30	10.2.49.125 – 10.2.49.126	10.2.49.127
97	10.2.49.128/30	10.2.49.129 – 10.2.49.130	10.2.49.131
98	10.2.49.132/30	10.2.49.133 – 10.2.49.134	10.2.49.135
99	10.2.49.136/30	10.2.49.137 – 10.2.49.138	10.2.49.139
100	10.2.49.140/30	10.2.49.141 – 10.2.49.142	10.2.49.143
101	10.2.49.144/30	10.2.49.145 – 10.2.49.146	10.2.49.147
102	10.2.49.148/30	10.2.49.149 – 10.2.49.150	10.2.49.151
103	10.2.49.152/30	10.2.49.153 – 10.2.49.154	10.2.49.155
104	10.2.49.156/30	10.2.49.157 – 10.2.49.158	10.2.49.159
105	10.2.49.160/30	10.2.49.161 – 10.2.49.162	10.2.49.163
106	10.2.49.164/30	10.2.49.165 – 10.2.49.166	10.2.49.167
107	10.2.49.168/30	10.2.49.169 – 10.2.49.170	10.2.49.171
108	10.2.49.172/30	10.2.49.173 – 10.2.49.174	10.2.49.175
109	10.2.49.176/30	10.2.49.177 – 10.2.49.178	10.2.49.179
110	10.2.49.180/30	10.2.49.181 – 10.2.49.182	10.2.49.183
111	10.2.49.184/30	10.2.49.185 – 10.2.49.186	10.2.49.187
112	10.2.49.188/30	10.2.49.189 – 10.2.49.190	10.2.49.191
113	10.2.49.192/30	10.2.49.193 – 10.2.49.194	10.2.49.195
114	10.2.49.196/30	10.2.49.197 – 10.2.49.198	10.2.49.199
115	10.2.49.200/30	10.2.49.201 – 10.2.49.202	10.2.49.203
116	10.2.49.204/30	10.2.49.205 – 10.2.49.206	10.2.49.207
117	10.2.49.208/30	10.2.49.209 – 10.2.49.210	10.2.49.211
118	10.2.49.212/30	10.2.49.213 – 10.2.49.214	10.2.49.215
119	10.2.49.216/30	10.2.49.217 – 10.2.49.218	10.2.49.219
120	10.2.49.220/30	10.2.49.221 – 10.2.49.222	10.2.49.223
121	10.2.49.224/30	10.2.49.225 – 10.2.49.226	10.2.49.227
122	10.2.49.228/30	10.2.49.229 – 10.2.49.230	10.2.49.231
123	10.2.49.232/30	10.2.49.233 – 10.2.49.234	10.2.49.235
124	10.2.49.236/30	10.2.49.237 – 10.2.49.238	10.2.49.239
125	10.2.49.240/30	10.2.49.241 – 10.2.49.242	10.2.49.243
126	10.2.49.244/30	10.2.49.245 – 10.2.49.246	10.2.49.247
127	10.2.49.248/30	10.2.49.249 – 10.2.49.250	10.2.49.251
128	10.2.49.252/30	10.2.49.253 – 10.2.49.254	10.2.49.255
129	10.2.50.0/30	10.2.50.1 – 10.2.50.2	10.2.50.3
130	10.2.50.4/30	10.2.50.5 – 10.2.50.6	10.2.50.7
131	10.2.50.8/30	10.2.50.9 – 10.2.50.10	10.2.50.11
132	10.2.50.12/30	10.2.50.13 – 10.2.50.14	10.2.50.15
133	10.2.50.16/30	10.2.50.17 – 10.2.50.18	10.2.50.19
134	10.2.50.20/30	10.2.50.21 – 10.2.50.22	10.2.50.23
135	10.2.50.24/30	10.2.50.25 – 10.2.50.26	10.2.50.27
136	10.2.50.28/30	10.2.50.29 – 10.2.50.30	10.2.50.31
137	10.2.50.32/30	10.2.50.33 – 10.2.50.34	10.2.50.35
138	10.2.50.36/30	10.2.50.37 – 10.2.50.38	10.2.50.39
139	10.2.50.40/30	10.2.50.41 – 10.2.50.42	10.2.50.43
140	10.2.50.44/30	10.2.50.45 – 10.2.50.46	10.2.50.47
141	10.2.50.48/30	10.2.50.49 – 10.2.50.50	10.2.50.51
142	10.2.50.52/30	10.2.50.53 – 10.2.50.54	10.2.50.55
143	10.2.50.56/30	10.2.50.57 – 10.2.50.58	10.2.50.59
144	10.2.50.60/30	10.2.50.61 – 10.2.50.62	10.2.50.63
145	10.2.50.64/30	10.2.50.65 – 10.2.50.66	10.2.50.67
146	10.2.50.68/30	10.2.50.69 – 10.2.50.70	10.2.50.71
147	10.2.50.72/30	10.2.50.73 – 10.2.50.74	10.2.50.75
148	10.2.50.76/30	10.2.50.77 – 10.2.50.78	10.2.50.79
149	10.2.50.80/30	10.2.50.81 – 10.2.50.82	10.2.50.83
150	10.2.50.84/30	10.2.50.85 – 10.2.50.86	10.2.50.87
151	10.2.50.88/30	10.2.50.89 – 10.2.50.90	10.2.50.91
152	10.2.50.92/30	10.2.50.93 – 10.2.50.94	10.2.50.95
153	10.2.50.96/30	10.2.50.97 – 10.2.50.98	10.2.50.99
154	10.2.50.100/30	10.2.50.101 – 10.2.50.102	10.2.50.103
155	10.2.50.104/30	10.2.50.105 – 10.2.50.106	10.2.50.107
156	10.2.50.108/30	10.2.50.109 – 10.2.50.110	10.2.50.111
157	10.2.50.112/30	10.2.50.113 – 10.2.50.114	10.2.50.115
158	10.2.50.116/30	10.2.50.117 – 10.2.50.118	10.2.50.119
159	10.2.50.120/30	10.2.50.121 – 10.2.50.122	10.2.50.123
160	10.2.50.124/30	10.2.50.125 – 10.2.50.126	10.2.50.127
161	10.2.50.128/30	10.2.50.129 – 10.2.50.130	10.2.50.131
162	10.2.50.132/30	10.2.50.133 – 10.2.50.134	10.2.50.135
163	10.2.50.136/30	10.2.50.137 – 10.2.50.138	10.2.50.139
164	10.2.50.140/30	10.2.50.141 – 10.2.50.142	10.2.50.143
165	10.2.50.144/30	10.2.50.145 – 10.2.50.146	10.2.50.147
166	10.2.50.148/30	10.2.50.149 – 10.2.50.150	10.2.50.151
167	10.2.50.152/30	10.2.50.153 – 10.2.50.154	10.2.50.155
168	10.2.50.156/30	10.2.50.157 – 10.2.50.158	10.2.50.159
169	10.2.50.160/30	10.2.50.161 – 10.2.50.162	10.2.50.163
170	10.2.50.164/30	10.2.50.165 – 10.2.50.166	10.2.50.167
171	10.2.50.168/30	10.2.50.169 – 10.2.50.170	10.2.50.171
172	10.2.50.172/30	10.2.50.173 – 10.2.50.174	10.2.50.175
173	10.2.50.176/30	10.2.50.177 – 10.2.50.178	10.2.50.179
174	10.2.50.180/30	10.2.50.181 – 10.2.50.182	10.2.50.183
175	10.2.50.184/30	10.2.50.185 – 10.2.50.186	10.2.50.187
176	10.2.50.188/30	10.2.50.189 – 10.2.50.190	10.2.50.191
177	10.2.50.192/30	10.2.50.193 – 10.2.50.194	10.2.50.195
178	10.2.50.196/30	10.2.50.197 – 10.2.50.198	10.2.50.199
179	10.2.50.200/30	10.2.50.201 – 10.2.50.202	10.2.50.203
180	10.2.50.204/30	10.2.50.205 – 10.2.50.206	10.2.50.207
181	10.2.50.208/30	10.2.50.209 – 10.2.50.210	10.2.50.211
182	10.2.50.212/30	10.2.50.213 – 10.2.50.214	10.2.50.215
183	10.2.50.216/30	10.2.50.217 – 10.2.50.218	10.2.50.219
184	10.2.50.220/30	10.2.50.221 – 10.2.50.222	10.2.50.223
185	10.2.50.224/30	10.2.50.225 – 10.2.50.226	10.2.50.227
186	10.2.50.228/30	10.2.50.229 – 10.2.50.230	10.2.50.231
187	10.2.50.232/30	10.2.50.233 – 10.2.50.234	10.2.50.235
188	10.2.50.236/30	10.2.50.237 – 10.2.50.238	10.2.50.239
189	10.2.50.240/30	10.2.50.241 – 10.2.50.242	10.2.50.243
190	10.2.50.244/30	10.2.50.245 – 10.2.50.246	10.2.50.247
191	10.2.50.248/30	10.2.50.249 – 10.2.50.250	10.2.50.251
192	10.2.50.252/30	10.2.50.253 – 10.2.50.254	10.2.50.255
193	10.2.51.0/30	10.2.51.1 – 10.2.51.2	10.2.51.3
194	10.2.51.4/30	10.2.51.5 – 10.2.51.6	10.2.51.7
195	10.2.51.8/30	10.2.51.9 – 10.2.51.10	10.2.51.11
196	10.2.51.12/30	10.2.51.13 – 10.2.51.14	10.2.51.15
197	10.2.51.16/30	10.2.51.17 – 10.2.51.18	10.2.51.19
198	10.2.51.20/30	10.2.51.21 – 10.2.51.22	10.2.51.23
199	10.2.51.24/30	10.2.51.25 – 10.2.51.26	10.2.51.27
200	10.2.51.28/30	10.2.51.29 – 10.2.51.30	10.2.51.31
201	10.2.51.32/30	10.2.51.33 – 10.2.51.34	10.2.51.35
202	10.2.51.36/30	10.2.51.37 – 10.2.51.38	10.2.51.39
203	10.2.51.40/30	10.2.51.41 – 10.2.51.42	10.2.51.43
204	10.2.51.44/30	10.2.51.45 – 10.2.51.46	10.2.51.47
205	10.2.51.48/30	10.2.51.49 – 10.2.51.50	10.2.51.51
206	10.2.51.52/30	10.2.51.53 – 10.2.51.54	10.2.51.55
207	10.2.51.56/30	10.2.51.57 – 10.2.51.58	10.2.51.59
208	10.2.51.60/30	10.2.51.61 – 10.2.51.62	10.2.51.63
209	10.2.51.64/30	10.2.51.65 – 10.2.51.66	10.2.51.67
210	10.2.51.68/30	10.2.51.69 – 10.2.51.70	10.2.51.71
211	10.2.51.72/30	10.2.51.73 – 10.2.51.74	10.2.51.75
212	10.2.51.76/30	10.2.51.77 – 10.2.51.78	10.2.51.79
213	10.2.51.80/30	10.2.51.81 – 10.2.51.82	10.2.51.83
214	10.2.51.84/30	10.2.51.85 – 10.2.51.86	10.2.51.87
215	10.2.51.88/30	10.2.51.89 – 10.2.51.90	10.2.51.91
216	10.2.51.92/30	10.2.51.93 – 10.2.51.94	10.2.51.95
217	10.2.51.96/30	10.2.51.97 – 10.2.51.98	10.2.51.99
218	10.2.51.100/30	10.2.51.101 – 10.2.51.102	10.2.51.103
219	10.2.51.104/30	10.2.51.105 – 10.2.51.106	10.2.51.107
220	10.2.51.108/30	10.2.51.109 – 10.2.51.110	10.2.51.111
221	10.2.51.112/30	10.2.51.113 – 10.2.51.114	10.2.51.115
222	10.2.51.116/30	10.2.51.117 – 10.2.51.118	10.2.51.119
223	10.2.51.120/30	10.2.51.121 – 10.2.51.122	10.2.51.123
224	10.2.51.124/30	10.2.51.125 – 10.2.51.126	10.2.51.127
225	10.2.51.128/30	10.2.51.129 – 10.2.51.130	10.2.51.131
226	10.2.51.132/30	10.2.51.133 – 10.2.51.134	10.2.51.135
227	10.2.51.136/30	10.2.51.137 – 10.2.51.138	10.2.51.139
228	10.2.51.140/30	10.2.51.141 – 10.2.51.142	10.2.51.143
229	10.2.51.144/30	10.2.51.145 – 10.2.51.146	10.2.51.147
230	10.2.51.148/30	10.2.51.149 – 10.2.51.150	10.2.51.151
231	10.2.51.152/30	10.2.51.153 – 10.2.51.154	10.2.51.155
232	10.2.51.156/30	10.2.51.157 – 10.2.51.158	10.2.51.159
233	10.2.51.160/30	10.2.51.161 – 10.2.51.162	10.2.51.163
234	10.2.51.164/30	10.2.51.165 – 10.2.51.166	10.2.51.167
235	10.2.51.168/30	10.2.51.169 – 10.2.51.170	10.2.51.171
236	10.2.51.172/30	10.2.51.173 – 10.2.51.174	10.2.51.175
237	10.2.51.176/30	10.2.51.177 – 10.2.51.178	10.2.51.179
238	10.2.51.180/30	10.2.51.181 – 10.2.51.182	10.2.51.183
239	10.2.51.184/30	10.2.51.185 – 10.2.51.186	10.2.51.187
240	10.2.51.188/30	10.2.51.189 – 10.2.51.190	10.2.51.191
241	10.2.51.192/30	10.2.51.193 – 10.2.51.194	10.2.51.195
242	10.2.51.196/30	10.2.51.197 – 10.2.51.198	10.2.51.199
243	10.2.51.200/30	10.2.51.201 – 10.2.51.202	10.2.51.203
244	10.2.51.204/30	10.2.51.205 – 10.2.51.206	10.2.51.207
245	10.2.51.208/30	10.2.51.209 – 10.2.51.210	10.2.51.211
246	10.2.51.212/30	10.2.51.213 – 10.2.51.214	10.2.51.215
247	10.2.51.216/30	10.2.51.217 – 10.2.51.218	10.2.51.219
248	10.2.51.220/30	10.2.51.221 – 10.2.51.222	10.2.51.223
249	10.2.51.224/30	10.2.51.225 – 10.2.51.226	10.2.51.227
250	10.2.51.228/30	10.2.51.229 – 10.2.51.230	10.2.51.231
251	10.2.51.232/30	10.2.51.233 – 10.2.51.234	10.2.51.235
252	10.2.51.236/30	10.2.51.237 – 10.2.51.238	10.2.51.239
253	10.2.51.240/30	10.2.51.241 – 10.2.51.242	10.2.51.243
254	10.2.51.244/30	10.2.51.245 – 10.2.51.246	10.2.51.247
255	10.2.51.248/30	10.2.51.249 – 10.2.51.250	10.2.51.251
256	10.2.51.252/30	10.2.51.253 – 10.2.51.254	10.2.51.255

showing 256 of 512

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 →