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)10.18.26.0/23

network10.18.26.0/23

broadcast10.18.27.255

first host10.18.26.1

last host10.18.27.254

subnet mask255.255.254.0

wildcard0.0.1.255

addresses512

usable hosts510

classA

ipcalc 10.18.26.0/23

address00001010.00010010.00011010.00000000

subnet mask11111111.11111111.11111110.00000000

network00001010.00010010.00011010.00000000

broadcast00001010.00010010.00011011.11111111

green = network part, grey = host part

hex0x0a121a00

decimal168958464

reverse dns0.26.18.10.in-addr.arpa

ipv4-mapped::ffff:a12:1a00

/23 split into /32 · 512 subnets

close ×

#	network	host range	broadcast
1	10.18.26.0/32	10.18.26.0 – 10.18.26.0	10.18.26.0
2	10.18.26.1/32	10.18.26.1 – 10.18.26.1	10.18.26.1
3	10.18.26.2/32	10.18.26.2 – 10.18.26.2	10.18.26.2
4	10.18.26.3/32	10.18.26.3 – 10.18.26.3	10.18.26.3
5	10.18.26.4/32	10.18.26.4 – 10.18.26.4	10.18.26.4
6	10.18.26.5/32	10.18.26.5 – 10.18.26.5	10.18.26.5
7	10.18.26.6/32	10.18.26.6 – 10.18.26.6	10.18.26.6
8	10.18.26.7/32	10.18.26.7 – 10.18.26.7	10.18.26.7
9	10.18.26.8/32	10.18.26.8 – 10.18.26.8	10.18.26.8
10	10.18.26.9/32	10.18.26.9 – 10.18.26.9	10.18.26.9
11	10.18.26.10/32	10.18.26.10 – 10.18.26.10	10.18.26.10
12	10.18.26.11/32	10.18.26.11 – 10.18.26.11	10.18.26.11
13	10.18.26.12/32	10.18.26.12 – 10.18.26.12	10.18.26.12
14	10.18.26.13/32	10.18.26.13 – 10.18.26.13	10.18.26.13
15	10.18.26.14/32	10.18.26.14 – 10.18.26.14	10.18.26.14
16	10.18.26.15/32	10.18.26.15 – 10.18.26.15	10.18.26.15
17	10.18.26.16/32	10.18.26.16 – 10.18.26.16	10.18.26.16
18	10.18.26.17/32	10.18.26.17 – 10.18.26.17	10.18.26.17
19	10.18.26.18/32	10.18.26.18 – 10.18.26.18	10.18.26.18
20	10.18.26.19/32	10.18.26.19 – 10.18.26.19	10.18.26.19
21	10.18.26.20/32	10.18.26.20 – 10.18.26.20	10.18.26.20
22	10.18.26.21/32	10.18.26.21 – 10.18.26.21	10.18.26.21
23	10.18.26.22/32	10.18.26.22 – 10.18.26.22	10.18.26.22
24	10.18.26.23/32	10.18.26.23 – 10.18.26.23	10.18.26.23
25	10.18.26.24/32	10.18.26.24 – 10.18.26.24	10.18.26.24
26	10.18.26.25/32	10.18.26.25 – 10.18.26.25	10.18.26.25
27	10.18.26.26/32	10.18.26.26 – 10.18.26.26	10.18.26.26
28	10.18.26.27/32	10.18.26.27 – 10.18.26.27	10.18.26.27
29	10.18.26.28/32	10.18.26.28 – 10.18.26.28	10.18.26.28
30	10.18.26.29/32	10.18.26.29 – 10.18.26.29	10.18.26.29
31	10.18.26.30/32	10.18.26.30 – 10.18.26.30	10.18.26.30
32	10.18.26.31/32	10.18.26.31 – 10.18.26.31	10.18.26.31
33	10.18.26.32/32	10.18.26.32 – 10.18.26.32	10.18.26.32
34	10.18.26.33/32	10.18.26.33 – 10.18.26.33	10.18.26.33
35	10.18.26.34/32	10.18.26.34 – 10.18.26.34	10.18.26.34
36	10.18.26.35/32	10.18.26.35 – 10.18.26.35	10.18.26.35
37	10.18.26.36/32	10.18.26.36 – 10.18.26.36	10.18.26.36
38	10.18.26.37/32	10.18.26.37 – 10.18.26.37	10.18.26.37
39	10.18.26.38/32	10.18.26.38 – 10.18.26.38	10.18.26.38
40	10.18.26.39/32	10.18.26.39 – 10.18.26.39	10.18.26.39
41	10.18.26.40/32	10.18.26.40 – 10.18.26.40	10.18.26.40
42	10.18.26.41/32	10.18.26.41 – 10.18.26.41	10.18.26.41
43	10.18.26.42/32	10.18.26.42 – 10.18.26.42	10.18.26.42
44	10.18.26.43/32	10.18.26.43 – 10.18.26.43	10.18.26.43
45	10.18.26.44/32	10.18.26.44 – 10.18.26.44	10.18.26.44
46	10.18.26.45/32	10.18.26.45 – 10.18.26.45	10.18.26.45
47	10.18.26.46/32	10.18.26.46 – 10.18.26.46	10.18.26.46
48	10.18.26.47/32	10.18.26.47 – 10.18.26.47	10.18.26.47
49	10.18.26.48/32	10.18.26.48 – 10.18.26.48	10.18.26.48
50	10.18.26.49/32	10.18.26.49 – 10.18.26.49	10.18.26.49
51	10.18.26.50/32	10.18.26.50 – 10.18.26.50	10.18.26.50
52	10.18.26.51/32	10.18.26.51 – 10.18.26.51	10.18.26.51
53	10.18.26.52/32	10.18.26.52 – 10.18.26.52	10.18.26.52
54	10.18.26.53/32	10.18.26.53 – 10.18.26.53	10.18.26.53
55	10.18.26.54/32	10.18.26.54 – 10.18.26.54	10.18.26.54
56	10.18.26.55/32	10.18.26.55 – 10.18.26.55	10.18.26.55
57	10.18.26.56/32	10.18.26.56 – 10.18.26.56	10.18.26.56
58	10.18.26.57/32	10.18.26.57 – 10.18.26.57	10.18.26.57
59	10.18.26.58/32	10.18.26.58 – 10.18.26.58	10.18.26.58
60	10.18.26.59/32	10.18.26.59 – 10.18.26.59	10.18.26.59
61	10.18.26.60/32	10.18.26.60 – 10.18.26.60	10.18.26.60
62	10.18.26.61/32	10.18.26.61 – 10.18.26.61	10.18.26.61
63	10.18.26.62/32	10.18.26.62 – 10.18.26.62	10.18.26.62
64	10.18.26.63/32	10.18.26.63 – 10.18.26.63	10.18.26.63
65	10.18.26.64/32	10.18.26.64 – 10.18.26.64	10.18.26.64
66	10.18.26.65/32	10.18.26.65 – 10.18.26.65	10.18.26.65
67	10.18.26.66/32	10.18.26.66 – 10.18.26.66	10.18.26.66
68	10.18.26.67/32	10.18.26.67 – 10.18.26.67	10.18.26.67
69	10.18.26.68/32	10.18.26.68 – 10.18.26.68	10.18.26.68
70	10.18.26.69/32	10.18.26.69 – 10.18.26.69	10.18.26.69
71	10.18.26.70/32	10.18.26.70 – 10.18.26.70	10.18.26.70
72	10.18.26.71/32	10.18.26.71 – 10.18.26.71	10.18.26.71
73	10.18.26.72/32	10.18.26.72 – 10.18.26.72	10.18.26.72
74	10.18.26.73/32	10.18.26.73 – 10.18.26.73	10.18.26.73
75	10.18.26.74/32	10.18.26.74 – 10.18.26.74	10.18.26.74
76	10.18.26.75/32	10.18.26.75 – 10.18.26.75	10.18.26.75
77	10.18.26.76/32	10.18.26.76 – 10.18.26.76	10.18.26.76
78	10.18.26.77/32	10.18.26.77 – 10.18.26.77	10.18.26.77
79	10.18.26.78/32	10.18.26.78 – 10.18.26.78	10.18.26.78
80	10.18.26.79/32	10.18.26.79 – 10.18.26.79	10.18.26.79
81	10.18.26.80/32	10.18.26.80 – 10.18.26.80	10.18.26.80
82	10.18.26.81/32	10.18.26.81 – 10.18.26.81	10.18.26.81
83	10.18.26.82/32	10.18.26.82 – 10.18.26.82	10.18.26.82
84	10.18.26.83/32	10.18.26.83 – 10.18.26.83	10.18.26.83
85	10.18.26.84/32	10.18.26.84 – 10.18.26.84	10.18.26.84
86	10.18.26.85/32	10.18.26.85 – 10.18.26.85	10.18.26.85
87	10.18.26.86/32	10.18.26.86 – 10.18.26.86	10.18.26.86
88	10.18.26.87/32	10.18.26.87 – 10.18.26.87	10.18.26.87
89	10.18.26.88/32	10.18.26.88 – 10.18.26.88	10.18.26.88
90	10.18.26.89/32	10.18.26.89 – 10.18.26.89	10.18.26.89
91	10.18.26.90/32	10.18.26.90 – 10.18.26.90	10.18.26.90
92	10.18.26.91/32	10.18.26.91 – 10.18.26.91	10.18.26.91
93	10.18.26.92/32	10.18.26.92 – 10.18.26.92	10.18.26.92
94	10.18.26.93/32	10.18.26.93 – 10.18.26.93	10.18.26.93
95	10.18.26.94/32	10.18.26.94 – 10.18.26.94	10.18.26.94
96	10.18.26.95/32	10.18.26.95 – 10.18.26.95	10.18.26.95
97	10.18.26.96/32	10.18.26.96 – 10.18.26.96	10.18.26.96
98	10.18.26.97/32	10.18.26.97 – 10.18.26.97	10.18.26.97
99	10.18.26.98/32	10.18.26.98 – 10.18.26.98	10.18.26.98
100	10.18.26.99/32	10.18.26.99 – 10.18.26.99	10.18.26.99
101	10.18.26.100/32	10.18.26.100 – 10.18.26.100	10.18.26.100
102	10.18.26.101/32	10.18.26.101 – 10.18.26.101	10.18.26.101
103	10.18.26.102/32	10.18.26.102 – 10.18.26.102	10.18.26.102
104	10.18.26.103/32	10.18.26.103 – 10.18.26.103	10.18.26.103
105	10.18.26.104/32	10.18.26.104 – 10.18.26.104	10.18.26.104
106	10.18.26.105/32	10.18.26.105 – 10.18.26.105	10.18.26.105
107	10.18.26.106/32	10.18.26.106 – 10.18.26.106	10.18.26.106
108	10.18.26.107/32	10.18.26.107 – 10.18.26.107	10.18.26.107
109	10.18.26.108/32	10.18.26.108 – 10.18.26.108	10.18.26.108
110	10.18.26.109/32	10.18.26.109 – 10.18.26.109	10.18.26.109
111	10.18.26.110/32	10.18.26.110 – 10.18.26.110	10.18.26.110
112	10.18.26.111/32	10.18.26.111 – 10.18.26.111	10.18.26.111
113	10.18.26.112/32	10.18.26.112 – 10.18.26.112	10.18.26.112
114	10.18.26.113/32	10.18.26.113 – 10.18.26.113	10.18.26.113
115	10.18.26.114/32	10.18.26.114 – 10.18.26.114	10.18.26.114
116	10.18.26.115/32	10.18.26.115 – 10.18.26.115	10.18.26.115
117	10.18.26.116/32	10.18.26.116 – 10.18.26.116	10.18.26.116
118	10.18.26.117/32	10.18.26.117 – 10.18.26.117	10.18.26.117
119	10.18.26.118/32	10.18.26.118 – 10.18.26.118	10.18.26.118
120	10.18.26.119/32	10.18.26.119 – 10.18.26.119	10.18.26.119
121	10.18.26.120/32	10.18.26.120 – 10.18.26.120	10.18.26.120
122	10.18.26.121/32	10.18.26.121 – 10.18.26.121	10.18.26.121
123	10.18.26.122/32	10.18.26.122 – 10.18.26.122	10.18.26.122
124	10.18.26.123/32	10.18.26.123 – 10.18.26.123	10.18.26.123
125	10.18.26.124/32	10.18.26.124 – 10.18.26.124	10.18.26.124
126	10.18.26.125/32	10.18.26.125 – 10.18.26.125	10.18.26.125
127	10.18.26.126/32	10.18.26.126 – 10.18.26.126	10.18.26.126
128	10.18.26.127/32	10.18.26.127 – 10.18.26.127	10.18.26.127
129	10.18.26.128/32	10.18.26.128 – 10.18.26.128	10.18.26.128
130	10.18.26.129/32	10.18.26.129 – 10.18.26.129	10.18.26.129
131	10.18.26.130/32	10.18.26.130 – 10.18.26.130	10.18.26.130
132	10.18.26.131/32	10.18.26.131 – 10.18.26.131	10.18.26.131
133	10.18.26.132/32	10.18.26.132 – 10.18.26.132	10.18.26.132
134	10.18.26.133/32	10.18.26.133 – 10.18.26.133	10.18.26.133
135	10.18.26.134/32	10.18.26.134 – 10.18.26.134	10.18.26.134
136	10.18.26.135/32	10.18.26.135 – 10.18.26.135	10.18.26.135
137	10.18.26.136/32	10.18.26.136 – 10.18.26.136	10.18.26.136
138	10.18.26.137/32	10.18.26.137 – 10.18.26.137	10.18.26.137
139	10.18.26.138/32	10.18.26.138 – 10.18.26.138	10.18.26.138
140	10.18.26.139/32	10.18.26.139 – 10.18.26.139	10.18.26.139
141	10.18.26.140/32	10.18.26.140 – 10.18.26.140	10.18.26.140
142	10.18.26.141/32	10.18.26.141 – 10.18.26.141	10.18.26.141
143	10.18.26.142/32	10.18.26.142 – 10.18.26.142	10.18.26.142
144	10.18.26.143/32	10.18.26.143 – 10.18.26.143	10.18.26.143
145	10.18.26.144/32	10.18.26.144 – 10.18.26.144	10.18.26.144
146	10.18.26.145/32	10.18.26.145 – 10.18.26.145	10.18.26.145
147	10.18.26.146/32	10.18.26.146 – 10.18.26.146	10.18.26.146
148	10.18.26.147/32	10.18.26.147 – 10.18.26.147	10.18.26.147
149	10.18.26.148/32	10.18.26.148 – 10.18.26.148	10.18.26.148
150	10.18.26.149/32	10.18.26.149 – 10.18.26.149	10.18.26.149
151	10.18.26.150/32	10.18.26.150 – 10.18.26.150	10.18.26.150
152	10.18.26.151/32	10.18.26.151 – 10.18.26.151	10.18.26.151
153	10.18.26.152/32	10.18.26.152 – 10.18.26.152	10.18.26.152
154	10.18.26.153/32	10.18.26.153 – 10.18.26.153	10.18.26.153
155	10.18.26.154/32	10.18.26.154 – 10.18.26.154	10.18.26.154
156	10.18.26.155/32	10.18.26.155 – 10.18.26.155	10.18.26.155
157	10.18.26.156/32	10.18.26.156 – 10.18.26.156	10.18.26.156
158	10.18.26.157/32	10.18.26.157 – 10.18.26.157	10.18.26.157
159	10.18.26.158/32	10.18.26.158 – 10.18.26.158	10.18.26.158
160	10.18.26.159/32	10.18.26.159 – 10.18.26.159	10.18.26.159
161	10.18.26.160/32	10.18.26.160 – 10.18.26.160	10.18.26.160
162	10.18.26.161/32	10.18.26.161 – 10.18.26.161	10.18.26.161
163	10.18.26.162/32	10.18.26.162 – 10.18.26.162	10.18.26.162
164	10.18.26.163/32	10.18.26.163 – 10.18.26.163	10.18.26.163
165	10.18.26.164/32	10.18.26.164 – 10.18.26.164	10.18.26.164
166	10.18.26.165/32	10.18.26.165 – 10.18.26.165	10.18.26.165
167	10.18.26.166/32	10.18.26.166 – 10.18.26.166	10.18.26.166
168	10.18.26.167/32	10.18.26.167 – 10.18.26.167	10.18.26.167
169	10.18.26.168/32	10.18.26.168 – 10.18.26.168	10.18.26.168
170	10.18.26.169/32	10.18.26.169 – 10.18.26.169	10.18.26.169
171	10.18.26.170/32	10.18.26.170 – 10.18.26.170	10.18.26.170
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210	10.18.26.209/32	10.18.26.209 – 10.18.26.209	10.18.26.209
211	10.18.26.210/32	10.18.26.210 – 10.18.26.210	10.18.26.210
212	10.18.26.211/32	10.18.26.211 – 10.18.26.211	10.18.26.211
213	10.18.26.212/32	10.18.26.212 – 10.18.26.212	10.18.26.212
214	10.18.26.213/32	10.18.26.213 – 10.18.26.213	10.18.26.213
215	10.18.26.214/32	10.18.26.214 – 10.18.26.214	10.18.26.214
216	10.18.26.215/32	10.18.26.215 – 10.18.26.215	10.18.26.215
217	10.18.26.216/32	10.18.26.216 – 10.18.26.216	10.18.26.216
218	10.18.26.217/32	10.18.26.217 – 10.18.26.217	10.18.26.217
219	10.18.26.218/32	10.18.26.218 – 10.18.26.218	10.18.26.218
220	10.18.26.219/32	10.18.26.219 – 10.18.26.219	10.18.26.219
221	10.18.26.220/32	10.18.26.220 – 10.18.26.220	10.18.26.220
222	10.18.26.221/32	10.18.26.221 – 10.18.26.221	10.18.26.221
223	10.18.26.222/32	10.18.26.222 – 10.18.26.222	10.18.26.222
224	10.18.26.223/32	10.18.26.223 – 10.18.26.223	10.18.26.223
225	10.18.26.224/32	10.18.26.224 – 10.18.26.224	10.18.26.224
226	10.18.26.225/32	10.18.26.225 – 10.18.26.225	10.18.26.225
227	10.18.26.226/32	10.18.26.226 – 10.18.26.226	10.18.26.226
228	10.18.26.227/32	10.18.26.227 – 10.18.26.227	10.18.26.227
229	10.18.26.228/32	10.18.26.228 – 10.18.26.228	10.18.26.228
230	10.18.26.229/32	10.18.26.229 – 10.18.26.229	10.18.26.229
231	10.18.26.230/32	10.18.26.230 – 10.18.26.230	10.18.26.230
232	10.18.26.231/32	10.18.26.231 – 10.18.26.231	10.18.26.231
233	10.18.26.232/32	10.18.26.232 – 10.18.26.232	10.18.26.232
234	10.18.26.233/32	10.18.26.233 – 10.18.26.233	10.18.26.233
235	10.18.26.234/32	10.18.26.234 – 10.18.26.234	10.18.26.234
236	10.18.26.235/32	10.18.26.235 – 10.18.26.235	10.18.26.235
237	10.18.26.236/32	10.18.26.236 – 10.18.26.236	10.18.26.236
238	10.18.26.237/32	10.18.26.237 – 10.18.26.237	10.18.26.237
239	10.18.26.238/32	10.18.26.238 – 10.18.26.238	10.18.26.238
240	10.18.26.239/32	10.18.26.239 – 10.18.26.239	10.18.26.239
241	10.18.26.240/32	10.18.26.240 – 10.18.26.240	10.18.26.240
242	10.18.26.241/32	10.18.26.241 – 10.18.26.241	10.18.26.241
243	10.18.26.242/32	10.18.26.242 – 10.18.26.242	10.18.26.242
244	10.18.26.243/32	10.18.26.243 – 10.18.26.243	10.18.26.243
245	10.18.26.244/32	10.18.26.244 – 10.18.26.244	10.18.26.244
246	10.18.26.245/32	10.18.26.245 – 10.18.26.245	10.18.26.245
247	10.18.26.246/32	10.18.26.246 – 10.18.26.246	10.18.26.246
248	10.18.26.247/32	10.18.26.247 – 10.18.26.247	10.18.26.247
249	10.18.26.248/32	10.18.26.248 – 10.18.26.248	10.18.26.248
250	10.18.26.249/32	10.18.26.249 – 10.18.26.249	10.18.26.249
251	10.18.26.250/32	10.18.26.250 – 10.18.26.250	10.18.26.250
252	10.18.26.251/32	10.18.26.251 – 10.18.26.251	10.18.26.251
253	10.18.26.252/32	10.18.26.252 – 10.18.26.252	10.18.26.252
254	10.18.26.253/32	10.18.26.253 – 10.18.26.253	10.18.26.253
255	10.18.26.254/32	10.18.26.254 – 10.18.26.254	10.18.26.254
256	10.18.26.255/32	10.18.26.255 – 10.18.26.255	10.18.26.255

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 /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 →