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)10.2.130.0/23

network10.2.130.0/23

broadcast10.2.131.255

first host10.2.130.1

last host10.2.131.254

subnet mask255.255.254.0

wildcard0.0.1.255

addresses512

usable hosts510

classA

ipcalc 10.2.130.0/23

address00001010.00000010.10000010.00000000

subnet mask11111111.11111111.11111110.00000000

network00001010.00000010.10000010.00000000

broadcast00001010.00000010.10000011.11111111

green = network part, grey = host part

hex0x0a028200

decimal167936512

reverse dns0.130.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:8200

/23 split into /31 · 256 subnets

close ×

#	network	host range	broadcast
1	10.2.130.0/31	10.2.130.0 – 10.2.130.1	10.2.130.1
2	10.2.130.2/31	10.2.130.2 – 10.2.130.3	10.2.130.3
3	10.2.130.4/31	10.2.130.4 – 10.2.130.5	10.2.130.5
4	10.2.130.6/31	10.2.130.6 – 10.2.130.7	10.2.130.7
5	10.2.130.8/31	10.2.130.8 – 10.2.130.9	10.2.130.9
6	10.2.130.10/31	10.2.130.10 – 10.2.130.11	10.2.130.11
7	10.2.130.12/31	10.2.130.12 – 10.2.130.13	10.2.130.13
8	10.2.130.14/31	10.2.130.14 – 10.2.130.15	10.2.130.15
9	10.2.130.16/31	10.2.130.16 – 10.2.130.17	10.2.130.17
10	10.2.130.18/31	10.2.130.18 – 10.2.130.19	10.2.130.19
11	10.2.130.20/31	10.2.130.20 – 10.2.130.21	10.2.130.21
12	10.2.130.22/31	10.2.130.22 – 10.2.130.23	10.2.130.23
13	10.2.130.24/31	10.2.130.24 – 10.2.130.25	10.2.130.25
14	10.2.130.26/31	10.2.130.26 – 10.2.130.27	10.2.130.27
15	10.2.130.28/31	10.2.130.28 – 10.2.130.29	10.2.130.29
16	10.2.130.30/31	10.2.130.30 – 10.2.130.31	10.2.130.31
17	10.2.130.32/31	10.2.130.32 – 10.2.130.33	10.2.130.33
18	10.2.130.34/31	10.2.130.34 – 10.2.130.35	10.2.130.35
19	10.2.130.36/31	10.2.130.36 – 10.2.130.37	10.2.130.37
20	10.2.130.38/31	10.2.130.38 – 10.2.130.39	10.2.130.39
21	10.2.130.40/31	10.2.130.40 – 10.2.130.41	10.2.130.41
22	10.2.130.42/31	10.2.130.42 – 10.2.130.43	10.2.130.43
23	10.2.130.44/31	10.2.130.44 – 10.2.130.45	10.2.130.45
24	10.2.130.46/31	10.2.130.46 – 10.2.130.47	10.2.130.47
25	10.2.130.48/31	10.2.130.48 – 10.2.130.49	10.2.130.49
26	10.2.130.50/31	10.2.130.50 – 10.2.130.51	10.2.130.51
27	10.2.130.52/31	10.2.130.52 – 10.2.130.53	10.2.130.53
28	10.2.130.54/31	10.2.130.54 – 10.2.130.55	10.2.130.55
29	10.2.130.56/31	10.2.130.56 – 10.2.130.57	10.2.130.57
30	10.2.130.58/31	10.2.130.58 – 10.2.130.59	10.2.130.59
31	10.2.130.60/31	10.2.130.60 – 10.2.130.61	10.2.130.61
32	10.2.130.62/31	10.2.130.62 – 10.2.130.63	10.2.130.63
33	10.2.130.64/31	10.2.130.64 – 10.2.130.65	10.2.130.65
34	10.2.130.66/31	10.2.130.66 – 10.2.130.67	10.2.130.67
35	10.2.130.68/31	10.2.130.68 – 10.2.130.69	10.2.130.69
36	10.2.130.70/31	10.2.130.70 – 10.2.130.71	10.2.130.71
37	10.2.130.72/31	10.2.130.72 – 10.2.130.73	10.2.130.73
38	10.2.130.74/31	10.2.130.74 – 10.2.130.75	10.2.130.75
39	10.2.130.76/31	10.2.130.76 – 10.2.130.77	10.2.130.77
40	10.2.130.78/31	10.2.130.78 – 10.2.130.79	10.2.130.79
41	10.2.130.80/31	10.2.130.80 – 10.2.130.81	10.2.130.81
42	10.2.130.82/31	10.2.130.82 – 10.2.130.83	10.2.130.83
43	10.2.130.84/31	10.2.130.84 – 10.2.130.85	10.2.130.85
44	10.2.130.86/31	10.2.130.86 – 10.2.130.87	10.2.130.87
45	10.2.130.88/31	10.2.130.88 – 10.2.130.89	10.2.130.89
46	10.2.130.90/31	10.2.130.90 – 10.2.130.91	10.2.130.91
47	10.2.130.92/31	10.2.130.92 – 10.2.130.93	10.2.130.93
48	10.2.130.94/31	10.2.130.94 – 10.2.130.95	10.2.130.95
49	10.2.130.96/31	10.2.130.96 – 10.2.130.97	10.2.130.97
50	10.2.130.98/31	10.2.130.98 – 10.2.130.99	10.2.130.99
51	10.2.130.100/31	10.2.130.100 – 10.2.130.101	10.2.130.101
52	10.2.130.102/31	10.2.130.102 – 10.2.130.103	10.2.130.103
53	10.2.130.104/31	10.2.130.104 – 10.2.130.105	10.2.130.105
54	10.2.130.106/31	10.2.130.106 – 10.2.130.107	10.2.130.107
55	10.2.130.108/31	10.2.130.108 – 10.2.130.109	10.2.130.109
56	10.2.130.110/31	10.2.130.110 – 10.2.130.111	10.2.130.111
57	10.2.130.112/31	10.2.130.112 – 10.2.130.113	10.2.130.113
58	10.2.130.114/31	10.2.130.114 – 10.2.130.115	10.2.130.115
59	10.2.130.116/31	10.2.130.116 – 10.2.130.117	10.2.130.117
60	10.2.130.118/31	10.2.130.118 – 10.2.130.119	10.2.130.119
61	10.2.130.120/31	10.2.130.120 – 10.2.130.121	10.2.130.121
62	10.2.130.122/31	10.2.130.122 – 10.2.130.123	10.2.130.123
63	10.2.130.124/31	10.2.130.124 – 10.2.130.125	10.2.130.125
64	10.2.130.126/31	10.2.130.126 – 10.2.130.127	10.2.130.127
65	10.2.130.128/31	10.2.130.128 – 10.2.130.129	10.2.130.129
66	10.2.130.130/31	10.2.130.130 – 10.2.130.131	10.2.130.131
67	10.2.130.132/31	10.2.130.132 – 10.2.130.133	10.2.130.133
68	10.2.130.134/31	10.2.130.134 – 10.2.130.135	10.2.130.135
69	10.2.130.136/31	10.2.130.136 – 10.2.130.137	10.2.130.137
70	10.2.130.138/31	10.2.130.138 – 10.2.130.139	10.2.130.139
71	10.2.130.140/31	10.2.130.140 – 10.2.130.141	10.2.130.141
72	10.2.130.142/31	10.2.130.142 – 10.2.130.143	10.2.130.143
73	10.2.130.144/31	10.2.130.144 – 10.2.130.145	10.2.130.145
74	10.2.130.146/31	10.2.130.146 – 10.2.130.147	10.2.130.147
75	10.2.130.148/31	10.2.130.148 – 10.2.130.149	10.2.130.149
76	10.2.130.150/31	10.2.130.150 – 10.2.130.151	10.2.130.151
77	10.2.130.152/31	10.2.130.152 – 10.2.130.153	10.2.130.153
78	10.2.130.154/31	10.2.130.154 – 10.2.130.155	10.2.130.155
79	10.2.130.156/31	10.2.130.156 – 10.2.130.157	10.2.130.157
80	10.2.130.158/31	10.2.130.158 – 10.2.130.159	10.2.130.159
81	10.2.130.160/31	10.2.130.160 – 10.2.130.161	10.2.130.161
82	10.2.130.162/31	10.2.130.162 – 10.2.130.163	10.2.130.163
83	10.2.130.164/31	10.2.130.164 – 10.2.130.165	10.2.130.165
84	10.2.130.166/31	10.2.130.166 – 10.2.130.167	10.2.130.167
85	10.2.130.168/31	10.2.130.168 – 10.2.130.169	10.2.130.169
86	10.2.130.170/31	10.2.130.170 – 10.2.130.171	10.2.130.171
87	10.2.130.172/31	10.2.130.172 – 10.2.130.173	10.2.130.173
88	10.2.130.174/31	10.2.130.174 – 10.2.130.175	10.2.130.175
89	10.2.130.176/31	10.2.130.176 – 10.2.130.177	10.2.130.177
90	10.2.130.178/31	10.2.130.178 – 10.2.130.179	10.2.130.179
91	10.2.130.180/31	10.2.130.180 – 10.2.130.181	10.2.130.181
92	10.2.130.182/31	10.2.130.182 – 10.2.130.183	10.2.130.183
93	10.2.130.184/31	10.2.130.184 – 10.2.130.185	10.2.130.185
94	10.2.130.186/31	10.2.130.186 – 10.2.130.187	10.2.130.187
95	10.2.130.188/31	10.2.130.188 – 10.2.130.189	10.2.130.189
96	10.2.130.190/31	10.2.130.190 – 10.2.130.191	10.2.130.191
97	10.2.130.192/31	10.2.130.192 – 10.2.130.193	10.2.130.193
98	10.2.130.194/31	10.2.130.194 – 10.2.130.195	10.2.130.195
99	10.2.130.196/31	10.2.130.196 – 10.2.130.197	10.2.130.197
100	10.2.130.198/31	10.2.130.198 – 10.2.130.199	10.2.130.199
101	10.2.130.200/31	10.2.130.200 – 10.2.130.201	10.2.130.201
102	10.2.130.202/31	10.2.130.202 – 10.2.130.203	10.2.130.203
103	10.2.130.204/31	10.2.130.204 – 10.2.130.205	10.2.130.205
104	10.2.130.206/31	10.2.130.206 – 10.2.130.207	10.2.130.207
105	10.2.130.208/31	10.2.130.208 – 10.2.130.209	10.2.130.209
106	10.2.130.210/31	10.2.130.210 – 10.2.130.211	10.2.130.211
107	10.2.130.212/31	10.2.130.212 – 10.2.130.213	10.2.130.213
108	10.2.130.214/31	10.2.130.214 – 10.2.130.215	10.2.130.215
109	10.2.130.216/31	10.2.130.216 – 10.2.130.217	10.2.130.217
110	10.2.130.218/31	10.2.130.218 – 10.2.130.219	10.2.130.219
111	10.2.130.220/31	10.2.130.220 – 10.2.130.221	10.2.130.221
112	10.2.130.222/31	10.2.130.222 – 10.2.130.223	10.2.130.223
113	10.2.130.224/31	10.2.130.224 – 10.2.130.225	10.2.130.225
114	10.2.130.226/31	10.2.130.226 – 10.2.130.227	10.2.130.227
115	10.2.130.228/31	10.2.130.228 – 10.2.130.229	10.2.130.229
116	10.2.130.230/31	10.2.130.230 – 10.2.130.231	10.2.130.231
117	10.2.130.232/31	10.2.130.232 – 10.2.130.233	10.2.130.233
118	10.2.130.234/31	10.2.130.234 – 10.2.130.235	10.2.130.235
119	10.2.130.236/31	10.2.130.236 – 10.2.130.237	10.2.130.237
120	10.2.130.238/31	10.2.130.238 – 10.2.130.239	10.2.130.239
121	10.2.130.240/31	10.2.130.240 – 10.2.130.241	10.2.130.241
122	10.2.130.242/31	10.2.130.242 – 10.2.130.243	10.2.130.243
123	10.2.130.244/31	10.2.130.244 – 10.2.130.245	10.2.130.245
124	10.2.130.246/31	10.2.130.246 – 10.2.130.247	10.2.130.247
125	10.2.130.248/31	10.2.130.248 – 10.2.130.249	10.2.130.249
126	10.2.130.250/31	10.2.130.250 – 10.2.130.251	10.2.130.251
127	10.2.130.252/31	10.2.130.252 – 10.2.130.253	10.2.130.253
128	10.2.130.254/31	10.2.130.254 – 10.2.130.255	10.2.130.255
129	10.2.131.0/31	10.2.131.0 – 10.2.131.1	10.2.131.1
130	10.2.131.2/31	10.2.131.2 – 10.2.131.3	10.2.131.3
131	10.2.131.4/31	10.2.131.4 – 10.2.131.5	10.2.131.5
132	10.2.131.6/31	10.2.131.6 – 10.2.131.7	10.2.131.7
133	10.2.131.8/31	10.2.131.8 – 10.2.131.9	10.2.131.9
134	10.2.131.10/31	10.2.131.10 – 10.2.131.11	10.2.131.11
135	10.2.131.12/31	10.2.131.12 – 10.2.131.13	10.2.131.13
136	10.2.131.14/31	10.2.131.14 – 10.2.131.15	10.2.131.15
137	10.2.131.16/31	10.2.131.16 – 10.2.131.17	10.2.131.17
138	10.2.131.18/31	10.2.131.18 – 10.2.131.19	10.2.131.19
139	10.2.131.20/31	10.2.131.20 – 10.2.131.21	10.2.131.21
140	10.2.131.22/31	10.2.131.22 – 10.2.131.23	10.2.131.23
141	10.2.131.24/31	10.2.131.24 – 10.2.131.25	10.2.131.25
142	10.2.131.26/31	10.2.131.26 – 10.2.131.27	10.2.131.27
143	10.2.131.28/31	10.2.131.28 – 10.2.131.29	10.2.131.29
144	10.2.131.30/31	10.2.131.30 – 10.2.131.31	10.2.131.31
145	10.2.131.32/31	10.2.131.32 – 10.2.131.33	10.2.131.33
146	10.2.131.34/31	10.2.131.34 – 10.2.131.35	10.2.131.35
147	10.2.131.36/31	10.2.131.36 – 10.2.131.37	10.2.131.37
148	10.2.131.38/31	10.2.131.38 – 10.2.131.39	10.2.131.39
149	10.2.131.40/31	10.2.131.40 – 10.2.131.41	10.2.131.41
150	10.2.131.42/31	10.2.131.42 – 10.2.131.43	10.2.131.43
151	10.2.131.44/31	10.2.131.44 – 10.2.131.45	10.2.131.45
152	10.2.131.46/31	10.2.131.46 – 10.2.131.47	10.2.131.47
153	10.2.131.48/31	10.2.131.48 – 10.2.131.49	10.2.131.49
154	10.2.131.50/31	10.2.131.50 – 10.2.131.51	10.2.131.51
155	10.2.131.52/31	10.2.131.52 – 10.2.131.53	10.2.131.53
156	10.2.131.54/31	10.2.131.54 – 10.2.131.55	10.2.131.55
157	10.2.131.56/31	10.2.131.56 – 10.2.131.57	10.2.131.57
158	10.2.131.58/31	10.2.131.58 – 10.2.131.59	10.2.131.59
159	10.2.131.60/31	10.2.131.60 – 10.2.131.61	10.2.131.61
160	10.2.131.62/31	10.2.131.62 – 10.2.131.63	10.2.131.63
161	10.2.131.64/31	10.2.131.64 – 10.2.131.65	10.2.131.65
162	10.2.131.66/31	10.2.131.66 – 10.2.131.67	10.2.131.67
163	10.2.131.68/31	10.2.131.68 – 10.2.131.69	10.2.131.69
164	10.2.131.70/31	10.2.131.70 – 10.2.131.71	10.2.131.71
165	10.2.131.72/31	10.2.131.72 – 10.2.131.73	10.2.131.73
166	10.2.131.74/31	10.2.131.74 – 10.2.131.75	10.2.131.75
167	10.2.131.76/31	10.2.131.76 – 10.2.131.77	10.2.131.77
168	10.2.131.78/31	10.2.131.78 – 10.2.131.79	10.2.131.79
169	10.2.131.80/31	10.2.131.80 – 10.2.131.81	10.2.131.81
170	10.2.131.82/31	10.2.131.82 – 10.2.131.83	10.2.131.83
171	10.2.131.84/31	10.2.131.84 – 10.2.131.85	10.2.131.85
172	10.2.131.86/31	10.2.131.86 – 10.2.131.87	10.2.131.87
173	10.2.131.88/31	10.2.131.88 – 10.2.131.89	10.2.131.89
174	10.2.131.90/31	10.2.131.90 – 10.2.131.91	10.2.131.91
175	10.2.131.92/31	10.2.131.92 – 10.2.131.93	10.2.131.93
176	10.2.131.94/31	10.2.131.94 – 10.2.131.95	10.2.131.95
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186	10.2.131.114/31	10.2.131.114 – 10.2.131.115	10.2.131.115
187	10.2.131.116/31	10.2.131.116 – 10.2.131.117	10.2.131.117
188	10.2.131.118/31	10.2.131.118 – 10.2.131.119	10.2.131.119
189	10.2.131.120/31	10.2.131.120 – 10.2.131.121	10.2.131.121
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197	10.2.131.136/31	10.2.131.136 – 10.2.131.137	10.2.131.137
198	10.2.131.138/31	10.2.131.138 – 10.2.131.139	10.2.131.139
199	10.2.131.140/31	10.2.131.140 – 10.2.131.141	10.2.131.141
200	10.2.131.142/31	10.2.131.142 – 10.2.131.143	10.2.131.143
201	10.2.131.144/31	10.2.131.144 – 10.2.131.145	10.2.131.145
202	10.2.131.146/31	10.2.131.146 – 10.2.131.147	10.2.131.147
203	10.2.131.148/31	10.2.131.148 – 10.2.131.149	10.2.131.149
204	10.2.131.150/31	10.2.131.150 – 10.2.131.151	10.2.131.151
205	10.2.131.152/31	10.2.131.152 – 10.2.131.153	10.2.131.153
206	10.2.131.154/31	10.2.131.154 – 10.2.131.155	10.2.131.155
207	10.2.131.156/31	10.2.131.156 – 10.2.131.157	10.2.131.157
208	10.2.131.158/31	10.2.131.158 – 10.2.131.159	10.2.131.159
209	10.2.131.160/31	10.2.131.160 – 10.2.131.161	10.2.131.161
210	10.2.131.162/31	10.2.131.162 – 10.2.131.163	10.2.131.163
211	10.2.131.164/31	10.2.131.164 – 10.2.131.165	10.2.131.165
212	10.2.131.166/31	10.2.131.166 – 10.2.131.167	10.2.131.167
213	10.2.131.168/31	10.2.131.168 – 10.2.131.169	10.2.131.169
214	10.2.131.170/31	10.2.131.170 – 10.2.131.171	10.2.131.171
215	10.2.131.172/31	10.2.131.172 – 10.2.131.173	10.2.131.173
216	10.2.131.174/31	10.2.131.174 – 10.2.131.175	10.2.131.175
217	10.2.131.176/31	10.2.131.176 – 10.2.131.177	10.2.131.177
218	10.2.131.178/31	10.2.131.178 – 10.2.131.179	10.2.131.179
219	10.2.131.180/31	10.2.131.180 – 10.2.131.181	10.2.131.181
220	10.2.131.182/31	10.2.131.182 – 10.2.131.183	10.2.131.183
221	10.2.131.184/31	10.2.131.184 – 10.2.131.185	10.2.131.185
222	10.2.131.186/31	10.2.131.186 – 10.2.131.187	10.2.131.187
223	10.2.131.188/31	10.2.131.188 – 10.2.131.189	10.2.131.189
224	10.2.131.190/31	10.2.131.190 – 10.2.131.191	10.2.131.191
225	10.2.131.192/31	10.2.131.192 – 10.2.131.193	10.2.131.193
226	10.2.131.194/31	10.2.131.194 – 10.2.131.195	10.2.131.195
227	10.2.131.196/31	10.2.131.196 – 10.2.131.197	10.2.131.197
228	10.2.131.198/31	10.2.131.198 – 10.2.131.199	10.2.131.199
229	10.2.131.200/31	10.2.131.200 – 10.2.131.201	10.2.131.201
230	10.2.131.202/31	10.2.131.202 – 10.2.131.203	10.2.131.203
231	10.2.131.204/31	10.2.131.204 – 10.2.131.205	10.2.131.205
232	10.2.131.206/31	10.2.131.206 – 10.2.131.207	10.2.131.207
233	10.2.131.208/31	10.2.131.208 – 10.2.131.209	10.2.131.209
234	10.2.131.210/31	10.2.131.210 – 10.2.131.211	10.2.131.211
235	10.2.131.212/31	10.2.131.212 – 10.2.131.213	10.2.131.213
236	10.2.131.214/31	10.2.131.214 – 10.2.131.215	10.2.131.215
237	10.2.131.216/31	10.2.131.216 – 10.2.131.217	10.2.131.217
238	10.2.131.218/31	10.2.131.218 – 10.2.131.219	10.2.131.219
239	10.2.131.220/31	10.2.131.220 – 10.2.131.221	10.2.131.221
240	10.2.131.222/31	10.2.131.222 – 10.2.131.223	10.2.131.223
241	10.2.131.224/31	10.2.131.224 – 10.2.131.225	10.2.131.225
242	10.2.131.226/31	10.2.131.226 – 10.2.131.227	10.2.131.227
243	10.2.131.228/31	10.2.131.228 – 10.2.131.229	10.2.131.229
244	10.2.131.230/31	10.2.131.230 – 10.2.131.231	10.2.131.231
245	10.2.131.232/31	10.2.131.232 – 10.2.131.233	10.2.131.233
246	10.2.131.234/31	10.2.131.234 – 10.2.131.235	10.2.131.235
247	10.2.131.236/31	10.2.131.236 – 10.2.131.237	10.2.131.237
248	10.2.131.238/31	10.2.131.238 – 10.2.131.239	10.2.131.239
249	10.2.131.240/31	10.2.131.240 – 10.2.131.241	10.2.131.241
250	10.2.131.242/31	10.2.131.242 – 10.2.131.243	10.2.131.243
251	10.2.131.244/31	10.2.131.244 – 10.2.131.245	10.2.131.245
252	10.2.131.246/31	10.2.131.246 – 10.2.131.247	10.2.131.247
253	10.2.131.248/31	10.2.131.248 – 10.2.131.249	10.2.131.249
254	10.2.131.250/31	10.2.131.250 – 10.2.131.251	10.2.131.251
255	10.2.131.252/31	10.2.131.252 – 10.2.131.253	10.2.131.253
256	10.2.131.254/31	10.2.131.254 – 10.2.131.255	10.2.131.255

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 →