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)172.16.2.0/23

network172.16.2.0/23

broadcast172.16.3.255

first host172.16.2.1

last host172.16.3.254

subnet mask255.255.254.0

wildcard0.0.1.255

addresses512

usable hosts510

classB

ipcalc 172.16.2.0/23

address10101100.00010000.00000010.00000000

subnet mask11111111.11111111.11111110.00000000

network10101100.00010000.00000010.00000000

broadcast10101100.00010000.00000011.11111111

green = network part, grey = host part

hex0xac100200

decimal2886730240

reverse dns0.2.16.172.in-addr.arpa

ipv4-mapped::ffff:ac10:200

/23 split into /32 · 512 subnets

close ×

#	network	host range	broadcast
1	172.16.2.0/32	172.16.2.0 – 172.16.2.0	172.16.2.0
2	172.16.2.1/32	172.16.2.1 – 172.16.2.1	172.16.2.1
3	172.16.2.2/32	172.16.2.2 – 172.16.2.2	172.16.2.2
4	172.16.2.3/32	172.16.2.3 – 172.16.2.3	172.16.2.3
5	172.16.2.4/32	172.16.2.4 – 172.16.2.4	172.16.2.4
6	172.16.2.5/32	172.16.2.5 – 172.16.2.5	172.16.2.5
7	172.16.2.6/32	172.16.2.6 – 172.16.2.6	172.16.2.6
8	172.16.2.7/32	172.16.2.7 – 172.16.2.7	172.16.2.7
9	172.16.2.8/32	172.16.2.8 – 172.16.2.8	172.16.2.8
10	172.16.2.9/32	172.16.2.9 – 172.16.2.9	172.16.2.9
11	172.16.2.10/32	172.16.2.10 – 172.16.2.10	172.16.2.10
12	172.16.2.11/32	172.16.2.11 – 172.16.2.11	172.16.2.11
13	172.16.2.12/32	172.16.2.12 – 172.16.2.12	172.16.2.12
14	172.16.2.13/32	172.16.2.13 – 172.16.2.13	172.16.2.13
15	172.16.2.14/32	172.16.2.14 – 172.16.2.14	172.16.2.14
16	172.16.2.15/32	172.16.2.15 – 172.16.2.15	172.16.2.15
17	172.16.2.16/32	172.16.2.16 – 172.16.2.16	172.16.2.16
18	172.16.2.17/32	172.16.2.17 – 172.16.2.17	172.16.2.17
19	172.16.2.18/32	172.16.2.18 – 172.16.2.18	172.16.2.18
20	172.16.2.19/32	172.16.2.19 – 172.16.2.19	172.16.2.19
21	172.16.2.20/32	172.16.2.20 – 172.16.2.20	172.16.2.20
22	172.16.2.21/32	172.16.2.21 – 172.16.2.21	172.16.2.21
23	172.16.2.22/32	172.16.2.22 – 172.16.2.22	172.16.2.22
24	172.16.2.23/32	172.16.2.23 – 172.16.2.23	172.16.2.23
25	172.16.2.24/32	172.16.2.24 – 172.16.2.24	172.16.2.24
26	172.16.2.25/32	172.16.2.25 – 172.16.2.25	172.16.2.25
27	172.16.2.26/32	172.16.2.26 – 172.16.2.26	172.16.2.26
28	172.16.2.27/32	172.16.2.27 – 172.16.2.27	172.16.2.27
29	172.16.2.28/32	172.16.2.28 – 172.16.2.28	172.16.2.28
30	172.16.2.29/32	172.16.2.29 – 172.16.2.29	172.16.2.29
31	172.16.2.30/32	172.16.2.30 – 172.16.2.30	172.16.2.30
32	172.16.2.31/32	172.16.2.31 – 172.16.2.31	172.16.2.31
33	172.16.2.32/32	172.16.2.32 – 172.16.2.32	172.16.2.32
34	172.16.2.33/32	172.16.2.33 – 172.16.2.33	172.16.2.33
35	172.16.2.34/32	172.16.2.34 – 172.16.2.34	172.16.2.34
36	172.16.2.35/32	172.16.2.35 – 172.16.2.35	172.16.2.35
37	172.16.2.36/32	172.16.2.36 – 172.16.2.36	172.16.2.36
38	172.16.2.37/32	172.16.2.37 – 172.16.2.37	172.16.2.37
39	172.16.2.38/32	172.16.2.38 – 172.16.2.38	172.16.2.38
40	172.16.2.39/32	172.16.2.39 – 172.16.2.39	172.16.2.39
41	172.16.2.40/32	172.16.2.40 – 172.16.2.40	172.16.2.40
42	172.16.2.41/32	172.16.2.41 – 172.16.2.41	172.16.2.41
43	172.16.2.42/32	172.16.2.42 – 172.16.2.42	172.16.2.42
44	172.16.2.43/32	172.16.2.43 – 172.16.2.43	172.16.2.43
45	172.16.2.44/32	172.16.2.44 – 172.16.2.44	172.16.2.44
46	172.16.2.45/32	172.16.2.45 – 172.16.2.45	172.16.2.45
47	172.16.2.46/32	172.16.2.46 – 172.16.2.46	172.16.2.46
48	172.16.2.47/32	172.16.2.47 – 172.16.2.47	172.16.2.47
49	172.16.2.48/32	172.16.2.48 – 172.16.2.48	172.16.2.48
50	172.16.2.49/32	172.16.2.49 – 172.16.2.49	172.16.2.49
51	172.16.2.50/32	172.16.2.50 – 172.16.2.50	172.16.2.50
52	172.16.2.51/32	172.16.2.51 – 172.16.2.51	172.16.2.51
53	172.16.2.52/32	172.16.2.52 – 172.16.2.52	172.16.2.52
54	172.16.2.53/32	172.16.2.53 – 172.16.2.53	172.16.2.53
55	172.16.2.54/32	172.16.2.54 – 172.16.2.54	172.16.2.54
56	172.16.2.55/32	172.16.2.55 – 172.16.2.55	172.16.2.55
57	172.16.2.56/32	172.16.2.56 – 172.16.2.56	172.16.2.56
58	172.16.2.57/32	172.16.2.57 – 172.16.2.57	172.16.2.57
59	172.16.2.58/32	172.16.2.58 – 172.16.2.58	172.16.2.58
60	172.16.2.59/32	172.16.2.59 – 172.16.2.59	172.16.2.59
61	172.16.2.60/32	172.16.2.60 – 172.16.2.60	172.16.2.60
62	172.16.2.61/32	172.16.2.61 – 172.16.2.61	172.16.2.61
63	172.16.2.62/32	172.16.2.62 – 172.16.2.62	172.16.2.62
64	172.16.2.63/32	172.16.2.63 – 172.16.2.63	172.16.2.63
65	172.16.2.64/32	172.16.2.64 – 172.16.2.64	172.16.2.64
66	172.16.2.65/32	172.16.2.65 – 172.16.2.65	172.16.2.65
67	172.16.2.66/32	172.16.2.66 – 172.16.2.66	172.16.2.66
68	172.16.2.67/32	172.16.2.67 – 172.16.2.67	172.16.2.67
69	172.16.2.68/32	172.16.2.68 – 172.16.2.68	172.16.2.68
70	172.16.2.69/32	172.16.2.69 – 172.16.2.69	172.16.2.69
71	172.16.2.70/32	172.16.2.70 – 172.16.2.70	172.16.2.70
72	172.16.2.71/32	172.16.2.71 – 172.16.2.71	172.16.2.71
73	172.16.2.72/32	172.16.2.72 – 172.16.2.72	172.16.2.72
74	172.16.2.73/32	172.16.2.73 – 172.16.2.73	172.16.2.73
75	172.16.2.74/32	172.16.2.74 – 172.16.2.74	172.16.2.74
76	172.16.2.75/32	172.16.2.75 – 172.16.2.75	172.16.2.75
77	172.16.2.76/32	172.16.2.76 – 172.16.2.76	172.16.2.76
78	172.16.2.77/32	172.16.2.77 – 172.16.2.77	172.16.2.77
79	172.16.2.78/32	172.16.2.78 – 172.16.2.78	172.16.2.78
80	172.16.2.79/32	172.16.2.79 – 172.16.2.79	172.16.2.79
81	172.16.2.80/32	172.16.2.80 – 172.16.2.80	172.16.2.80
82	172.16.2.81/32	172.16.2.81 – 172.16.2.81	172.16.2.81
83	172.16.2.82/32	172.16.2.82 – 172.16.2.82	172.16.2.82
84	172.16.2.83/32	172.16.2.83 – 172.16.2.83	172.16.2.83
85	172.16.2.84/32	172.16.2.84 – 172.16.2.84	172.16.2.84
86	172.16.2.85/32	172.16.2.85 – 172.16.2.85	172.16.2.85
87	172.16.2.86/32	172.16.2.86 – 172.16.2.86	172.16.2.86
88	172.16.2.87/32	172.16.2.87 – 172.16.2.87	172.16.2.87
89	172.16.2.88/32	172.16.2.88 – 172.16.2.88	172.16.2.88
90	172.16.2.89/32	172.16.2.89 – 172.16.2.89	172.16.2.89
91	172.16.2.90/32	172.16.2.90 – 172.16.2.90	172.16.2.90
92	172.16.2.91/32	172.16.2.91 – 172.16.2.91	172.16.2.91
93	172.16.2.92/32	172.16.2.92 – 172.16.2.92	172.16.2.92
94	172.16.2.93/32	172.16.2.93 – 172.16.2.93	172.16.2.93
95	172.16.2.94/32	172.16.2.94 – 172.16.2.94	172.16.2.94
96	172.16.2.95/32	172.16.2.95 – 172.16.2.95	172.16.2.95
97	172.16.2.96/32	172.16.2.96 – 172.16.2.96	172.16.2.96
98	172.16.2.97/32	172.16.2.97 – 172.16.2.97	172.16.2.97
99	172.16.2.98/32	172.16.2.98 – 172.16.2.98	172.16.2.98
100	172.16.2.99/32	172.16.2.99 – 172.16.2.99	172.16.2.99
101	172.16.2.100/32	172.16.2.100 – 172.16.2.100	172.16.2.100
102	172.16.2.101/32	172.16.2.101 – 172.16.2.101	172.16.2.101
103	172.16.2.102/32	172.16.2.102 – 172.16.2.102	172.16.2.102
104	172.16.2.103/32	172.16.2.103 – 172.16.2.103	172.16.2.103
105	172.16.2.104/32	172.16.2.104 – 172.16.2.104	172.16.2.104
106	172.16.2.105/32	172.16.2.105 – 172.16.2.105	172.16.2.105
107	172.16.2.106/32	172.16.2.106 – 172.16.2.106	172.16.2.106
108	172.16.2.107/32	172.16.2.107 – 172.16.2.107	172.16.2.107
109	172.16.2.108/32	172.16.2.108 – 172.16.2.108	172.16.2.108
110	172.16.2.109/32	172.16.2.109 – 172.16.2.109	172.16.2.109
111	172.16.2.110/32	172.16.2.110 – 172.16.2.110	172.16.2.110
112	172.16.2.111/32	172.16.2.111 – 172.16.2.111	172.16.2.111
113	172.16.2.112/32	172.16.2.112 – 172.16.2.112	172.16.2.112
114	172.16.2.113/32	172.16.2.113 – 172.16.2.113	172.16.2.113
115	172.16.2.114/32	172.16.2.114 – 172.16.2.114	172.16.2.114
116	172.16.2.115/32	172.16.2.115 – 172.16.2.115	172.16.2.115
117	172.16.2.116/32	172.16.2.116 – 172.16.2.116	172.16.2.116
118	172.16.2.117/32	172.16.2.117 – 172.16.2.117	172.16.2.117
119	172.16.2.118/32	172.16.2.118 – 172.16.2.118	172.16.2.118
120	172.16.2.119/32	172.16.2.119 – 172.16.2.119	172.16.2.119
121	172.16.2.120/32	172.16.2.120 – 172.16.2.120	172.16.2.120
122	172.16.2.121/32	172.16.2.121 – 172.16.2.121	172.16.2.121
123	172.16.2.122/32	172.16.2.122 – 172.16.2.122	172.16.2.122
124	172.16.2.123/32	172.16.2.123 – 172.16.2.123	172.16.2.123
125	172.16.2.124/32	172.16.2.124 – 172.16.2.124	172.16.2.124
126	172.16.2.125/32	172.16.2.125 – 172.16.2.125	172.16.2.125
127	172.16.2.126/32	172.16.2.126 – 172.16.2.126	172.16.2.126
128	172.16.2.127/32	172.16.2.127 – 172.16.2.127	172.16.2.127
129	172.16.2.128/32	172.16.2.128 – 172.16.2.128	172.16.2.128
130	172.16.2.129/32	172.16.2.129 – 172.16.2.129	172.16.2.129
131	172.16.2.130/32	172.16.2.130 – 172.16.2.130	172.16.2.130
132	172.16.2.131/32	172.16.2.131 – 172.16.2.131	172.16.2.131
133	172.16.2.132/32	172.16.2.132 – 172.16.2.132	172.16.2.132
134	172.16.2.133/32	172.16.2.133 – 172.16.2.133	172.16.2.133
135	172.16.2.134/32	172.16.2.134 – 172.16.2.134	172.16.2.134
136	172.16.2.135/32	172.16.2.135 – 172.16.2.135	172.16.2.135
137	172.16.2.136/32	172.16.2.136 – 172.16.2.136	172.16.2.136
138	172.16.2.137/32	172.16.2.137 – 172.16.2.137	172.16.2.137
139	172.16.2.138/32	172.16.2.138 – 172.16.2.138	172.16.2.138
140	172.16.2.139/32	172.16.2.139 – 172.16.2.139	172.16.2.139
141	172.16.2.140/32	172.16.2.140 – 172.16.2.140	172.16.2.140
142	172.16.2.141/32	172.16.2.141 – 172.16.2.141	172.16.2.141
143	172.16.2.142/32	172.16.2.142 – 172.16.2.142	172.16.2.142
144	172.16.2.143/32	172.16.2.143 – 172.16.2.143	172.16.2.143
145	172.16.2.144/32	172.16.2.144 – 172.16.2.144	172.16.2.144
146	172.16.2.145/32	172.16.2.145 – 172.16.2.145	172.16.2.145
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210	172.16.2.209/32	172.16.2.209 – 172.16.2.209	172.16.2.209
211	172.16.2.210/32	172.16.2.210 – 172.16.2.210	172.16.2.210
212	172.16.2.211/32	172.16.2.211 – 172.16.2.211	172.16.2.211
213	172.16.2.212/32	172.16.2.212 – 172.16.2.212	172.16.2.212
214	172.16.2.213/32	172.16.2.213 – 172.16.2.213	172.16.2.213
215	172.16.2.214/32	172.16.2.214 – 172.16.2.214	172.16.2.214
216	172.16.2.215/32	172.16.2.215 – 172.16.2.215	172.16.2.215
217	172.16.2.216/32	172.16.2.216 – 172.16.2.216	172.16.2.216
218	172.16.2.217/32	172.16.2.217 – 172.16.2.217	172.16.2.217
219	172.16.2.218/32	172.16.2.218 – 172.16.2.218	172.16.2.218
220	172.16.2.219/32	172.16.2.219 – 172.16.2.219	172.16.2.219
221	172.16.2.220/32	172.16.2.220 – 172.16.2.220	172.16.2.220
222	172.16.2.221/32	172.16.2.221 – 172.16.2.221	172.16.2.221
223	172.16.2.222/32	172.16.2.222 – 172.16.2.222	172.16.2.222
224	172.16.2.223/32	172.16.2.223 – 172.16.2.223	172.16.2.223
225	172.16.2.224/32	172.16.2.224 – 172.16.2.224	172.16.2.224
226	172.16.2.225/32	172.16.2.225 – 172.16.2.225	172.16.2.225
227	172.16.2.226/32	172.16.2.226 – 172.16.2.226	172.16.2.226
228	172.16.2.227/32	172.16.2.227 – 172.16.2.227	172.16.2.227
229	172.16.2.228/32	172.16.2.228 – 172.16.2.228	172.16.2.228
230	172.16.2.229/32	172.16.2.229 – 172.16.2.229	172.16.2.229
231	172.16.2.230/32	172.16.2.230 – 172.16.2.230	172.16.2.230
232	172.16.2.231/32	172.16.2.231 – 172.16.2.231	172.16.2.231
233	172.16.2.232/32	172.16.2.232 – 172.16.2.232	172.16.2.232
234	172.16.2.233/32	172.16.2.233 – 172.16.2.233	172.16.2.233
235	172.16.2.234/32	172.16.2.234 – 172.16.2.234	172.16.2.234
236	172.16.2.235/32	172.16.2.235 – 172.16.2.235	172.16.2.235
237	172.16.2.236/32	172.16.2.236 – 172.16.2.236	172.16.2.236
238	172.16.2.237/32	172.16.2.237 – 172.16.2.237	172.16.2.237
239	172.16.2.238/32	172.16.2.238 – 172.16.2.238	172.16.2.238
240	172.16.2.239/32	172.16.2.239 – 172.16.2.239	172.16.2.239
241	172.16.2.240/32	172.16.2.240 – 172.16.2.240	172.16.2.240
242	172.16.2.241/32	172.16.2.241 – 172.16.2.241	172.16.2.241
243	172.16.2.242/32	172.16.2.242 – 172.16.2.242	172.16.2.242
244	172.16.2.243/32	172.16.2.243 – 172.16.2.243	172.16.2.243
245	172.16.2.244/32	172.16.2.244 – 172.16.2.244	172.16.2.244
246	172.16.2.245/32	172.16.2.245 – 172.16.2.245	172.16.2.245
247	172.16.2.246/32	172.16.2.246 – 172.16.2.246	172.16.2.246
248	172.16.2.247/32	172.16.2.247 – 172.16.2.247	172.16.2.247
249	172.16.2.248/32	172.16.2.248 – 172.16.2.248	172.16.2.248
250	172.16.2.249/32	172.16.2.249 – 172.16.2.249	172.16.2.249
251	172.16.2.250/32	172.16.2.250 – 172.16.2.250	172.16.2.250
252	172.16.2.251/32	172.16.2.251 – 172.16.2.251	172.16.2.251
253	172.16.2.252/32	172.16.2.252 – 172.16.2.252	172.16.2.252
254	172.16.2.253/32	172.16.2.253 – 172.16.2.253	172.16.2.253
255	172.16.2.254/32	172.16.2.254 – 172.16.2.254	172.16.2.254
256	172.16.2.255/32	172.16.2.255 – 172.16.2.255	172.16.2.255

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 →