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)10.17.128.0/18

network10.17.128.0/18

broadcast10.17.191.255

first host10.17.128.1

last host10.17.191.254

subnet mask255.255.192.0

wildcard0.0.63.255

addresses16,384

usable hosts16,382

classA

ipcalc 10.17.128.0/18

address00001010.00010001.10000000.00000000

subnet mask11111111.11111111.11000000.00000000

network00001010.00010001.10000000.00000000

broadcast00001010.00010001.10111111.11111111

green = network part, grey = host part

hex0x0a118000

decimal168919040

reverse dns0.128.17.10.in-addr.arpa

ipv4-mapped::ffff:a11:8000

/18 split into /32 · 16,384 subnets

close ×

#	network	host range	broadcast
1	10.17.128.0/32	10.17.128.0 – 10.17.128.0	10.17.128.0
2	10.17.128.1/32	10.17.128.1 – 10.17.128.1	10.17.128.1
3	10.17.128.2/32	10.17.128.2 – 10.17.128.2	10.17.128.2
4	10.17.128.3/32	10.17.128.3 – 10.17.128.3	10.17.128.3
5	10.17.128.4/32	10.17.128.4 – 10.17.128.4	10.17.128.4
6	10.17.128.5/32	10.17.128.5 – 10.17.128.5	10.17.128.5
7	10.17.128.6/32	10.17.128.6 – 10.17.128.6	10.17.128.6
8	10.17.128.7/32	10.17.128.7 – 10.17.128.7	10.17.128.7
9	10.17.128.8/32	10.17.128.8 – 10.17.128.8	10.17.128.8
10	10.17.128.9/32	10.17.128.9 – 10.17.128.9	10.17.128.9
11	10.17.128.10/32	10.17.128.10 – 10.17.128.10	10.17.128.10
12	10.17.128.11/32	10.17.128.11 – 10.17.128.11	10.17.128.11
13	10.17.128.12/32	10.17.128.12 – 10.17.128.12	10.17.128.12
14	10.17.128.13/32	10.17.128.13 – 10.17.128.13	10.17.128.13
15	10.17.128.14/32	10.17.128.14 – 10.17.128.14	10.17.128.14
16	10.17.128.15/32	10.17.128.15 – 10.17.128.15	10.17.128.15
17	10.17.128.16/32	10.17.128.16 – 10.17.128.16	10.17.128.16
18	10.17.128.17/32	10.17.128.17 – 10.17.128.17	10.17.128.17
19	10.17.128.18/32	10.17.128.18 – 10.17.128.18	10.17.128.18
20	10.17.128.19/32	10.17.128.19 – 10.17.128.19	10.17.128.19
21	10.17.128.20/32	10.17.128.20 – 10.17.128.20	10.17.128.20
22	10.17.128.21/32	10.17.128.21 – 10.17.128.21	10.17.128.21
23	10.17.128.22/32	10.17.128.22 – 10.17.128.22	10.17.128.22
24	10.17.128.23/32	10.17.128.23 – 10.17.128.23	10.17.128.23
25	10.17.128.24/32	10.17.128.24 – 10.17.128.24	10.17.128.24
26	10.17.128.25/32	10.17.128.25 – 10.17.128.25	10.17.128.25
27	10.17.128.26/32	10.17.128.26 – 10.17.128.26	10.17.128.26
28	10.17.128.27/32	10.17.128.27 – 10.17.128.27	10.17.128.27
29	10.17.128.28/32	10.17.128.28 – 10.17.128.28	10.17.128.28
30	10.17.128.29/32	10.17.128.29 – 10.17.128.29	10.17.128.29
31	10.17.128.30/32	10.17.128.30 – 10.17.128.30	10.17.128.30
32	10.17.128.31/32	10.17.128.31 – 10.17.128.31	10.17.128.31
33	10.17.128.32/32	10.17.128.32 – 10.17.128.32	10.17.128.32
34	10.17.128.33/32	10.17.128.33 – 10.17.128.33	10.17.128.33
35	10.17.128.34/32	10.17.128.34 – 10.17.128.34	10.17.128.34
36	10.17.128.35/32	10.17.128.35 – 10.17.128.35	10.17.128.35
37	10.17.128.36/32	10.17.128.36 – 10.17.128.36	10.17.128.36
38	10.17.128.37/32	10.17.128.37 – 10.17.128.37	10.17.128.37
39	10.17.128.38/32	10.17.128.38 – 10.17.128.38	10.17.128.38
40	10.17.128.39/32	10.17.128.39 – 10.17.128.39	10.17.128.39
41	10.17.128.40/32	10.17.128.40 – 10.17.128.40	10.17.128.40
42	10.17.128.41/32	10.17.128.41 – 10.17.128.41	10.17.128.41
43	10.17.128.42/32	10.17.128.42 – 10.17.128.42	10.17.128.42
44	10.17.128.43/32	10.17.128.43 – 10.17.128.43	10.17.128.43
45	10.17.128.44/32	10.17.128.44 – 10.17.128.44	10.17.128.44
46	10.17.128.45/32	10.17.128.45 – 10.17.128.45	10.17.128.45
47	10.17.128.46/32	10.17.128.46 – 10.17.128.46	10.17.128.46
48	10.17.128.47/32	10.17.128.47 – 10.17.128.47	10.17.128.47
49	10.17.128.48/32	10.17.128.48 – 10.17.128.48	10.17.128.48
50	10.17.128.49/32	10.17.128.49 – 10.17.128.49	10.17.128.49
51	10.17.128.50/32	10.17.128.50 – 10.17.128.50	10.17.128.50
52	10.17.128.51/32	10.17.128.51 – 10.17.128.51	10.17.128.51
53	10.17.128.52/32	10.17.128.52 – 10.17.128.52	10.17.128.52
54	10.17.128.53/32	10.17.128.53 – 10.17.128.53	10.17.128.53
55	10.17.128.54/32	10.17.128.54 – 10.17.128.54	10.17.128.54
56	10.17.128.55/32	10.17.128.55 – 10.17.128.55	10.17.128.55
57	10.17.128.56/32	10.17.128.56 – 10.17.128.56	10.17.128.56
58	10.17.128.57/32	10.17.128.57 – 10.17.128.57	10.17.128.57
59	10.17.128.58/32	10.17.128.58 – 10.17.128.58	10.17.128.58
60	10.17.128.59/32	10.17.128.59 – 10.17.128.59	10.17.128.59
61	10.17.128.60/32	10.17.128.60 – 10.17.128.60	10.17.128.60
62	10.17.128.61/32	10.17.128.61 – 10.17.128.61	10.17.128.61
63	10.17.128.62/32	10.17.128.62 – 10.17.128.62	10.17.128.62
64	10.17.128.63/32	10.17.128.63 – 10.17.128.63	10.17.128.63
65	10.17.128.64/32	10.17.128.64 – 10.17.128.64	10.17.128.64
66	10.17.128.65/32	10.17.128.65 – 10.17.128.65	10.17.128.65
67	10.17.128.66/32	10.17.128.66 – 10.17.128.66	10.17.128.66
68	10.17.128.67/32	10.17.128.67 – 10.17.128.67	10.17.128.67
69	10.17.128.68/32	10.17.128.68 – 10.17.128.68	10.17.128.68
70	10.17.128.69/32	10.17.128.69 – 10.17.128.69	10.17.128.69
71	10.17.128.70/32	10.17.128.70 – 10.17.128.70	10.17.128.70
72	10.17.128.71/32	10.17.128.71 – 10.17.128.71	10.17.128.71
73	10.17.128.72/32	10.17.128.72 – 10.17.128.72	10.17.128.72
74	10.17.128.73/32	10.17.128.73 – 10.17.128.73	10.17.128.73
75	10.17.128.74/32	10.17.128.74 – 10.17.128.74	10.17.128.74
76	10.17.128.75/32	10.17.128.75 – 10.17.128.75	10.17.128.75
77	10.17.128.76/32	10.17.128.76 – 10.17.128.76	10.17.128.76
78	10.17.128.77/32	10.17.128.77 – 10.17.128.77	10.17.128.77
79	10.17.128.78/32	10.17.128.78 – 10.17.128.78	10.17.128.78
80	10.17.128.79/32	10.17.128.79 – 10.17.128.79	10.17.128.79
81	10.17.128.80/32	10.17.128.80 – 10.17.128.80	10.17.128.80
82	10.17.128.81/32	10.17.128.81 – 10.17.128.81	10.17.128.81
83	10.17.128.82/32	10.17.128.82 – 10.17.128.82	10.17.128.82
84	10.17.128.83/32	10.17.128.83 – 10.17.128.83	10.17.128.83
85	10.17.128.84/32	10.17.128.84 – 10.17.128.84	10.17.128.84
86	10.17.128.85/32	10.17.128.85 – 10.17.128.85	10.17.128.85
87	10.17.128.86/32	10.17.128.86 – 10.17.128.86	10.17.128.86
88	10.17.128.87/32	10.17.128.87 – 10.17.128.87	10.17.128.87
89	10.17.128.88/32	10.17.128.88 – 10.17.128.88	10.17.128.88
90	10.17.128.89/32	10.17.128.89 – 10.17.128.89	10.17.128.89
91	10.17.128.90/32	10.17.128.90 – 10.17.128.90	10.17.128.90
92	10.17.128.91/32	10.17.128.91 – 10.17.128.91	10.17.128.91
93	10.17.128.92/32	10.17.128.92 – 10.17.128.92	10.17.128.92
94	10.17.128.93/32	10.17.128.93 – 10.17.128.93	10.17.128.93
95	10.17.128.94/32	10.17.128.94 – 10.17.128.94	10.17.128.94
96	10.17.128.95/32	10.17.128.95 – 10.17.128.95	10.17.128.95
97	10.17.128.96/32	10.17.128.96 – 10.17.128.96	10.17.128.96
98	10.17.128.97/32	10.17.128.97 – 10.17.128.97	10.17.128.97
99	10.17.128.98/32	10.17.128.98 – 10.17.128.98	10.17.128.98
100	10.17.128.99/32	10.17.128.99 – 10.17.128.99	10.17.128.99
101	10.17.128.100/32	10.17.128.100 – 10.17.128.100	10.17.128.100
102	10.17.128.101/32	10.17.128.101 – 10.17.128.101	10.17.128.101
103	10.17.128.102/32	10.17.128.102 – 10.17.128.102	10.17.128.102
104	10.17.128.103/32	10.17.128.103 – 10.17.128.103	10.17.128.103
105	10.17.128.104/32	10.17.128.104 – 10.17.128.104	10.17.128.104
106	10.17.128.105/32	10.17.128.105 – 10.17.128.105	10.17.128.105
107	10.17.128.106/32	10.17.128.106 – 10.17.128.106	10.17.128.106
108	10.17.128.107/32	10.17.128.107 – 10.17.128.107	10.17.128.107
109	10.17.128.108/32	10.17.128.108 – 10.17.128.108	10.17.128.108
110	10.17.128.109/32	10.17.128.109 – 10.17.128.109	10.17.128.109
111	10.17.128.110/32	10.17.128.110 – 10.17.128.110	10.17.128.110
112	10.17.128.111/32	10.17.128.111 – 10.17.128.111	10.17.128.111
113	10.17.128.112/32	10.17.128.112 – 10.17.128.112	10.17.128.112
114	10.17.128.113/32	10.17.128.113 – 10.17.128.113	10.17.128.113
115	10.17.128.114/32	10.17.128.114 – 10.17.128.114	10.17.128.114
116	10.17.128.115/32	10.17.128.115 – 10.17.128.115	10.17.128.115
117	10.17.128.116/32	10.17.128.116 – 10.17.128.116	10.17.128.116
118	10.17.128.117/32	10.17.128.117 – 10.17.128.117	10.17.128.117
119	10.17.128.118/32	10.17.128.118 – 10.17.128.118	10.17.128.118
120	10.17.128.119/32	10.17.128.119 – 10.17.128.119	10.17.128.119
121	10.17.128.120/32	10.17.128.120 – 10.17.128.120	10.17.128.120
122	10.17.128.121/32	10.17.128.121 – 10.17.128.121	10.17.128.121
123	10.17.128.122/32	10.17.128.122 – 10.17.128.122	10.17.128.122
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125	10.17.128.124/32	10.17.128.124 – 10.17.128.124	10.17.128.124
126	10.17.128.125/32	10.17.128.125 – 10.17.128.125	10.17.128.125
127	10.17.128.126/32	10.17.128.126 – 10.17.128.126	10.17.128.126
128	10.17.128.127/32	10.17.128.127 – 10.17.128.127	10.17.128.127
129	10.17.128.128/32	10.17.128.128 – 10.17.128.128	10.17.128.128
130	10.17.128.129/32	10.17.128.129 – 10.17.128.129	10.17.128.129
131	10.17.128.130/32	10.17.128.130 – 10.17.128.130	10.17.128.130
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133	10.17.128.132/32	10.17.128.132 – 10.17.128.132	10.17.128.132
134	10.17.128.133/32	10.17.128.133 – 10.17.128.133	10.17.128.133
135	10.17.128.134/32	10.17.128.134 – 10.17.128.134	10.17.128.134
136	10.17.128.135/32	10.17.128.135 – 10.17.128.135	10.17.128.135
137	10.17.128.136/32	10.17.128.136 – 10.17.128.136	10.17.128.136
138	10.17.128.137/32	10.17.128.137 – 10.17.128.137	10.17.128.137
139	10.17.128.138/32	10.17.128.138 – 10.17.128.138	10.17.128.138
140	10.17.128.139/32	10.17.128.139 – 10.17.128.139	10.17.128.139
141	10.17.128.140/32	10.17.128.140 – 10.17.128.140	10.17.128.140
142	10.17.128.141/32	10.17.128.141 – 10.17.128.141	10.17.128.141
143	10.17.128.142/32	10.17.128.142 – 10.17.128.142	10.17.128.142
144	10.17.128.143/32	10.17.128.143 – 10.17.128.143	10.17.128.143
145	10.17.128.144/32	10.17.128.144 – 10.17.128.144	10.17.128.144
146	10.17.128.145/32	10.17.128.145 – 10.17.128.145	10.17.128.145
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149	10.17.128.148/32	10.17.128.148 – 10.17.128.148	10.17.128.148
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210	10.17.128.209/32	10.17.128.209 – 10.17.128.209	10.17.128.209
211	10.17.128.210/32	10.17.128.210 – 10.17.128.210	10.17.128.210
212	10.17.128.211/32	10.17.128.211 – 10.17.128.211	10.17.128.211
213	10.17.128.212/32	10.17.128.212 – 10.17.128.212	10.17.128.212
214	10.17.128.213/32	10.17.128.213 – 10.17.128.213	10.17.128.213
215	10.17.128.214/32	10.17.128.214 – 10.17.128.214	10.17.128.214
216	10.17.128.215/32	10.17.128.215 – 10.17.128.215	10.17.128.215
217	10.17.128.216/32	10.17.128.216 – 10.17.128.216	10.17.128.216
218	10.17.128.217/32	10.17.128.217 – 10.17.128.217	10.17.128.217
219	10.17.128.218/32	10.17.128.218 – 10.17.128.218	10.17.128.218
220	10.17.128.219/32	10.17.128.219 – 10.17.128.219	10.17.128.219
221	10.17.128.220/32	10.17.128.220 – 10.17.128.220	10.17.128.220
222	10.17.128.221/32	10.17.128.221 – 10.17.128.221	10.17.128.221
223	10.17.128.222/32	10.17.128.222 – 10.17.128.222	10.17.128.222
224	10.17.128.223/32	10.17.128.223 – 10.17.128.223	10.17.128.223
225	10.17.128.224/32	10.17.128.224 – 10.17.128.224	10.17.128.224
226	10.17.128.225/32	10.17.128.225 – 10.17.128.225	10.17.128.225
227	10.17.128.226/32	10.17.128.226 – 10.17.128.226	10.17.128.226
228	10.17.128.227/32	10.17.128.227 – 10.17.128.227	10.17.128.227
229	10.17.128.228/32	10.17.128.228 – 10.17.128.228	10.17.128.228
230	10.17.128.229/32	10.17.128.229 – 10.17.128.229	10.17.128.229
231	10.17.128.230/32	10.17.128.230 – 10.17.128.230	10.17.128.230
232	10.17.128.231/32	10.17.128.231 – 10.17.128.231	10.17.128.231
233	10.17.128.232/32	10.17.128.232 – 10.17.128.232	10.17.128.232
234	10.17.128.233/32	10.17.128.233 – 10.17.128.233	10.17.128.233
235	10.17.128.234/32	10.17.128.234 – 10.17.128.234	10.17.128.234
236	10.17.128.235/32	10.17.128.235 – 10.17.128.235	10.17.128.235
237	10.17.128.236/32	10.17.128.236 – 10.17.128.236	10.17.128.236
238	10.17.128.237/32	10.17.128.237 – 10.17.128.237	10.17.128.237
239	10.17.128.238/32	10.17.128.238 – 10.17.128.238	10.17.128.238
240	10.17.128.239/32	10.17.128.239 – 10.17.128.239	10.17.128.239
241	10.17.128.240/32	10.17.128.240 – 10.17.128.240	10.17.128.240
242	10.17.128.241/32	10.17.128.241 – 10.17.128.241	10.17.128.241
243	10.17.128.242/32	10.17.128.242 – 10.17.128.242	10.17.128.242
244	10.17.128.243/32	10.17.128.243 – 10.17.128.243	10.17.128.243
245	10.17.128.244/32	10.17.128.244 – 10.17.128.244	10.17.128.244
246	10.17.128.245/32	10.17.128.245 – 10.17.128.245	10.17.128.245
247	10.17.128.246/32	10.17.128.246 – 10.17.128.246	10.17.128.246
248	10.17.128.247/32	10.17.128.247 – 10.17.128.247	10.17.128.247
249	10.17.128.248/32	10.17.128.248 – 10.17.128.248	10.17.128.248
250	10.17.128.249/32	10.17.128.249 – 10.17.128.249	10.17.128.249
251	10.17.128.250/32	10.17.128.250 – 10.17.128.250	10.17.128.250
252	10.17.128.251/32	10.17.128.251 – 10.17.128.251	10.17.128.251
253	10.17.128.252/32	10.17.128.252 – 10.17.128.252	10.17.128.252
254	10.17.128.253/32	10.17.128.253 – 10.17.128.253	10.17.128.253
255	10.17.128.254/32	10.17.128.254 – 10.17.128.254	10.17.128.254
256	10.17.128.255/32	10.17.128.255 – 10.17.128.255	10.17.128.255

showing 256 of 16,384

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 /18
/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	1
/19	255.255.224.0	8,192	8,190	2 split →
/20	255.255.240.0	4,096	4,094	4 split →
/21	255.255.248.0	2,048	2,046	8 split →
/22	255.255.252.0	1,024	1,022	16 split →
/23	255.255.254.0	512	510	32 split →
/24	255.255.255.0	256	254	64 split →
/25	255.255.255.128	128	126	128 split →
/26	255.255.255.192	64	62	256 split →
/27	255.255.255.224	32	30	512 split →
/28	255.255.255.240	16	14	1,024 split →
/29	255.255.255.248	8	6	2,048 split →
/30	255.255.255.252	4	2	4,096 split →
/31	255.255.255.254	2	2	8,192 split →
/32	255.255.255.255	1	1	16,384 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 →