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)10.4.144.0/20

network10.4.144.0/20

broadcast10.4.159.255

first host10.4.144.1

last host10.4.159.254

subnet mask255.255.240.0

wildcard0.0.15.255

addresses4,096

usable hosts4,094

classA

ipcalc 10.4.144.0/20

address00001010.00000100.10010000.00000000

subnet mask11111111.11111111.11110000.00000000

network00001010.00000100.10010000.00000000

broadcast00001010.00000100.10011111.11111111

green = network part, grey = host part

hex0x0a049000

decimal168071168

reverse dns0.144.4.10.in-addr.arpa

ipv4-mapped::ffff:a04:9000

/20 split into /32 · 4,096 subnets

close ×

#	network	host range	broadcast
1	10.4.144.0/32	10.4.144.0 – 10.4.144.0	10.4.144.0
2	10.4.144.1/32	10.4.144.1 – 10.4.144.1	10.4.144.1
3	10.4.144.2/32	10.4.144.2 – 10.4.144.2	10.4.144.2
4	10.4.144.3/32	10.4.144.3 – 10.4.144.3	10.4.144.3
5	10.4.144.4/32	10.4.144.4 – 10.4.144.4	10.4.144.4
6	10.4.144.5/32	10.4.144.5 – 10.4.144.5	10.4.144.5
7	10.4.144.6/32	10.4.144.6 – 10.4.144.6	10.4.144.6
8	10.4.144.7/32	10.4.144.7 – 10.4.144.7	10.4.144.7
9	10.4.144.8/32	10.4.144.8 – 10.4.144.8	10.4.144.8
10	10.4.144.9/32	10.4.144.9 – 10.4.144.9	10.4.144.9
11	10.4.144.10/32	10.4.144.10 – 10.4.144.10	10.4.144.10
12	10.4.144.11/32	10.4.144.11 – 10.4.144.11	10.4.144.11
13	10.4.144.12/32	10.4.144.12 – 10.4.144.12	10.4.144.12
14	10.4.144.13/32	10.4.144.13 – 10.4.144.13	10.4.144.13
15	10.4.144.14/32	10.4.144.14 – 10.4.144.14	10.4.144.14
16	10.4.144.15/32	10.4.144.15 – 10.4.144.15	10.4.144.15
17	10.4.144.16/32	10.4.144.16 – 10.4.144.16	10.4.144.16
18	10.4.144.17/32	10.4.144.17 – 10.4.144.17	10.4.144.17
19	10.4.144.18/32	10.4.144.18 – 10.4.144.18	10.4.144.18
20	10.4.144.19/32	10.4.144.19 – 10.4.144.19	10.4.144.19
21	10.4.144.20/32	10.4.144.20 – 10.4.144.20	10.4.144.20
22	10.4.144.21/32	10.4.144.21 – 10.4.144.21	10.4.144.21
23	10.4.144.22/32	10.4.144.22 – 10.4.144.22	10.4.144.22
24	10.4.144.23/32	10.4.144.23 – 10.4.144.23	10.4.144.23
25	10.4.144.24/32	10.4.144.24 – 10.4.144.24	10.4.144.24
26	10.4.144.25/32	10.4.144.25 – 10.4.144.25	10.4.144.25
27	10.4.144.26/32	10.4.144.26 – 10.4.144.26	10.4.144.26
28	10.4.144.27/32	10.4.144.27 – 10.4.144.27	10.4.144.27
29	10.4.144.28/32	10.4.144.28 – 10.4.144.28	10.4.144.28
30	10.4.144.29/32	10.4.144.29 – 10.4.144.29	10.4.144.29
31	10.4.144.30/32	10.4.144.30 – 10.4.144.30	10.4.144.30
32	10.4.144.31/32	10.4.144.31 – 10.4.144.31	10.4.144.31
33	10.4.144.32/32	10.4.144.32 – 10.4.144.32	10.4.144.32
34	10.4.144.33/32	10.4.144.33 – 10.4.144.33	10.4.144.33
35	10.4.144.34/32	10.4.144.34 – 10.4.144.34	10.4.144.34
36	10.4.144.35/32	10.4.144.35 – 10.4.144.35	10.4.144.35
37	10.4.144.36/32	10.4.144.36 – 10.4.144.36	10.4.144.36
38	10.4.144.37/32	10.4.144.37 – 10.4.144.37	10.4.144.37
39	10.4.144.38/32	10.4.144.38 – 10.4.144.38	10.4.144.38
40	10.4.144.39/32	10.4.144.39 – 10.4.144.39	10.4.144.39
41	10.4.144.40/32	10.4.144.40 – 10.4.144.40	10.4.144.40
42	10.4.144.41/32	10.4.144.41 – 10.4.144.41	10.4.144.41
43	10.4.144.42/32	10.4.144.42 – 10.4.144.42	10.4.144.42
44	10.4.144.43/32	10.4.144.43 – 10.4.144.43	10.4.144.43
45	10.4.144.44/32	10.4.144.44 – 10.4.144.44	10.4.144.44
46	10.4.144.45/32	10.4.144.45 – 10.4.144.45	10.4.144.45
47	10.4.144.46/32	10.4.144.46 – 10.4.144.46	10.4.144.46
48	10.4.144.47/32	10.4.144.47 – 10.4.144.47	10.4.144.47
49	10.4.144.48/32	10.4.144.48 – 10.4.144.48	10.4.144.48
50	10.4.144.49/32	10.4.144.49 – 10.4.144.49	10.4.144.49
51	10.4.144.50/32	10.4.144.50 – 10.4.144.50	10.4.144.50
52	10.4.144.51/32	10.4.144.51 – 10.4.144.51	10.4.144.51
53	10.4.144.52/32	10.4.144.52 – 10.4.144.52	10.4.144.52
54	10.4.144.53/32	10.4.144.53 – 10.4.144.53	10.4.144.53
55	10.4.144.54/32	10.4.144.54 – 10.4.144.54	10.4.144.54
56	10.4.144.55/32	10.4.144.55 – 10.4.144.55	10.4.144.55
57	10.4.144.56/32	10.4.144.56 – 10.4.144.56	10.4.144.56
58	10.4.144.57/32	10.4.144.57 – 10.4.144.57	10.4.144.57
59	10.4.144.58/32	10.4.144.58 – 10.4.144.58	10.4.144.58
60	10.4.144.59/32	10.4.144.59 – 10.4.144.59	10.4.144.59
61	10.4.144.60/32	10.4.144.60 – 10.4.144.60	10.4.144.60
62	10.4.144.61/32	10.4.144.61 – 10.4.144.61	10.4.144.61
63	10.4.144.62/32	10.4.144.62 – 10.4.144.62	10.4.144.62
64	10.4.144.63/32	10.4.144.63 – 10.4.144.63	10.4.144.63
65	10.4.144.64/32	10.4.144.64 – 10.4.144.64	10.4.144.64
66	10.4.144.65/32	10.4.144.65 – 10.4.144.65	10.4.144.65
67	10.4.144.66/32	10.4.144.66 – 10.4.144.66	10.4.144.66
68	10.4.144.67/32	10.4.144.67 – 10.4.144.67	10.4.144.67
69	10.4.144.68/32	10.4.144.68 – 10.4.144.68	10.4.144.68
70	10.4.144.69/32	10.4.144.69 – 10.4.144.69	10.4.144.69
71	10.4.144.70/32	10.4.144.70 – 10.4.144.70	10.4.144.70
72	10.4.144.71/32	10.4.144.71 – 10.4.144.71	10.4.144.71
73	10.4.144.72/32	10.4.144.72 – 10.4.144.72	10.4.144.72
74	10.4.144.73/32	10.4.144.73 – 10.4.144.73	10.4.144.73
75	10.4.144.74/32	10.4.144.74 – 10.4.144.74	10.4.144.74
76	10.4.144.75/32	10.4.144.75 – 10.4.144.75	10.4.144.75
77	10.4.144.76/32	10.4.144.76 – 10.4.144.76	10.4.144.76
78	10.4.144.77/32	10.4.144.77 – 10.4.144.77	10.4.144.77
79	10.4.144.78/32	10.4.144.78 – 10.4.144.78	10.4.144.78
80	10.4.144.79/32	10.4.144.79 – 10.4.144.79	10.4.144.79
81	10.4.144.80/32	10.4.144.80 – 10.4.144.80	10.4.144.80
82	10.4.144.81/32	10.4.144.81 – 10.4.144.81	10.4.144.81
83	10.4.144.82/32	10.4.144.82 – 10.4.144.82	10.4.144.82
84	10.4.144.83/32	10.4.144.83 – 10.4.144.83	10.4.144.83
85	10.4.144.84/32	10.4.144.84 – 10.4.144.84	10.4.144.84
86	10.4.144.85/32	10.4.144.85 – 10.4.144.85	10.4.144.85
87	10.4.144.86/32	10.4.144.86 – 10.4.144.86	10.4.144.86
88	10.4.144.87/32	10.4.144.87 – 10.4.144.87	10.4.144.87
89	10.4.144.88/32	10.4.144.88 – 10.4.144.88	10.4.144.88
90	10.4.144.89/32	10.4.144.89 – 10.4.144.89	10.4.144.89
91	10.4.144.90/32	10.4.144.90 – 10.4.144.90	10.4.144.90
92	10.4.144.91/32	10.4.144.91 – 10.4.144.91	10.4.144.91
93	10.4.144.92/32	10.4.144.92 – 10.4.144.92	10.4.144.92
94	10.4.144.93/32	10.4.144.93 – 10.4.144.93	10.4.144.93
95	10.4.144.94/32	10.4.144.94 – 10.4.144.94	10.4.144.94
96	10.4.144.95/32	10.4.144.95 – 10.4.144.95	10.4.144.95
97	10.4.144.96/32	10.4.144.96 – 10.4.144.96	10.4.144.96
98	10.4.144.97/32	10.4.144.97 – 10.4.144.97	10.4.144.97
99	10.4.144.98/32	10.4.144.98 – 10.4.144.98	10.4.144.98
100	10.4.144.99/32	10.4.144.99 – 10.4.144.99	10.4.144.99
101	10.4.144.100/32	10.4.144.100 – 10.4.144.100	10.4.144.100
102	10.4.144.101/32	10.4.144.101 – 10.4.144.101	10.4.144.101
103	10.4.144.102/32	10.4.144.102 – 10.4.144.102	10.4.144.102
104	10.4.144.103/32	10.4.144.103 – 10.4.144.103	10.4.144.103
105	10.4.144.104/32	10.4.144.104 – 10.4.144.104	10.4.144.104
106	10.4.144.105/32	10.4.144.105 – 10.4.144.105	10.4.144.105
107	10.4.144.106/32	10.4.144.106 – 10.4.144.106	10.4.144.106
108	10.4.144.107/32	10.4.144.107 – 10.4.144.107	10.4.144.107
109	10.4.144.108/32	10.4.144.108 – 10.4.144.108	10.4.144.108
110	10.4.144.109/32	10.4.144.109 – 10.4.144.109	10.4.144.109
111	10.4.144.110/32	10.4.144.110 – 10.4.144.110	10.4.144.110
112	10.4.144.111/32	10.4.144.111 – 10.4.144.111	10.4.144.111
113	10.4.144.112/32	10.4.144.112 – 10.4.144.112	10.4.144.112
114	10.4.144.113/32	10.4.144.113 – 10.4.144.113	10.4.144.113
115	10.4.144.114/32	10.4.144.114 – 10.4.144.114	10.4.144.114
116	10.4.144.115/32	10.4.144.115 – 10.4.144.115	10.4.144.115
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123	10.4.144.122/32	10.4.144.122 – 10.4.144.122	10.4.144.122
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125	10.4.144.124/32	10.4.144.124 – 10.4.144.124	10.4.144.124
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127	10.4.144.126/32	10.4.144.126 – 10.4.144.126	10.4.144.126
128	10.4.144.127/32	10.4.144.127 – 10.4.144.127	10.4.144.127
129	10.4.144.128/32	10.4.144.128 – 10.4.144.128	10.4.144.128
130	10.4.144.129/32	10.4.144.129 – 10.4.144.129	10.4.144.129
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133	10.4.144.132/32	10.4.144.132 – 10.4.144.132	10.4.144.132
134	10.4.144.133/32	10.4.144.133 – 10.4.144.133	10.4.144.133
135	10.4.144.134/32	10.4.144.134 – 10.4.144.134	10.4.144.134
136	10.4.144.135/32	10.4.144.135 – 10.4.144.135	10.4.144.135
137	10.4.144.136/32	10.4.144.136 – 10.4.144.136	10.4.144.136
138	10.4.144.137/32	10.4.144.137 – 10.4.144.137	10.4.144.137
139	10.4.144.138/32	10.4.144.138 – 10.4.144.138	10.4.144.138
140	10.4.144.139/32	10.4.144.139 – 10.4.144.139	10.4.144.139
141	10.4.144.140/32	10.4.144.140 – 10.4.144.140	10.4.144.140
142	10.4.144.141/32	10.4.144.141 – 10.4.144.141	10.4.144.141
143	10.4.144.142/32	10.4.144.142 – 10.4.144.142	10.4.144.142
144	10.4.144.143/32	10.4.144.143 – 10.4.144.143	10.4.144.143
145	10.4.144.144/32	10.4.144.144 – 10.4.144.144	10.4.144.144
146	10.4.144.145/32	10.4.144.145 – 10.4.144.145	10.4.144.145
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149	10.4.144.148/32	10.4.144.148 – 10.4.144.148	10.4.144.148
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210	10.4.144.209/32	10.4.144.209 – 10.4.144.209	10.4.144.209
211	10.4.144.210/32	10.4.144.210 – 10.4.144.210	10.4.144.210
212	10.4.144.211/32	10.4.144.211 – 10.4.144.211	10.4.144.211
213	10.4.144.212/32	10.4.144.212 – 10.4.144.212	10.4.144.212
214	10.4.144.213/32	10.4.144.213 – 10.4.144.213	10.4.144.213
215	10.4.144.214/32	10.4.144.214 – 10.4.144.214	10.4.144.214
216	10.4.144.215/32	10.4.144.215 – 10.4.144.215	10.4.144.215
217	10.4.144.216/32	10.4.144.216 – 10.4.144.216	10.4.144.216
218	10.4.144.217/32	10.4.144.217 – 10.4.144.217	10.4.144.217
219	10.4.144.218/32	10.4.144.218 – 10.4.144.218	10.4.144.218
220	10.4.144.219/32	10.4.144.219 – 10.4.144.219	10.4.144.219
221	10.4.144.220/32	10.4.144.220 – 10.4.144.220	10.4.144.220
222	10.4.144.221/32	10.4.144.221 – 10.4.144.221	10.4.144.221
223	10.4.144.222/32	10.4.144.222 – 10.4.144.222	10.4.144.222
224	10.4.144.223/32	10.4.144.223 – 10.4.144.223	10.4.144.223
225	10.4.144.224/32	10.4.144.224 – 10.4.144.224	10.4.144.224
226	10.4.144.225/32	10.4.144.225 – 10.4.144.225	10.4.144.225
227	10.4.144.226/32	10.4.144.226 – 10.4.144.226	10.4.144.226
228	10.4.144.227/32	10.4.144.227 – 10.4.144.227	10.4.144.227
229	10.4.144.228/32	10.4.144.228 – 10.4.144.228	10.4.144.228
230	10.4.144.229/32	10.4.144.229 – 10.4.144.229	10.4.144.229
231	10.4.144.230/32	10.4.144.230 – 10.4.144.230	10.4.144.230
232	10.4.144.231/32	10.4.144.231 – 10.4.144.231	10.4.144.231
233	10.4.144.232/32	10.4.144.232 – 10.4.144.232	10.4.144.232
234	10.4.144.233/32	10.4.144.233 – 10.4.144.233	10.4.144.233
235	10.4.144.234/32	10.4.144.234 – 10.4.144.234	10.4.144.234
236	10.4.144.235/32	10.4.144.235 – 10.4.144.235	10.4.144.235
237	10.4.144.236/32	10.4.144.236 – 10.4.144.236	10.4.144.236
238	10.4.144.237/32	10.4.144.237 – 10.4.144.237	10.4.144.237
239	10.4.144.238/32	10.4.144.238 – 10.4.144.238	10.4.144.238
240	10.4.144.239/32	10.4.144.239 – 10.4.144.239	10.4.144.239
241	10.4.144.240/32	10.4.144.240 – 10.4.144.240	10.4.144.240
242	10.4.144.241/32	10.4.144.241 – 10.4.144.241	10.4.144.241
243	10.4.144.242/32	10.4.144.242 – 10.4.144.242	10.4.144.242
244	10.4.144.243/32	10.4.144.243 – 10.4.144.243	10.4.144.243
245	10.4.144.244/32	10.4.144.244 – 10.4.144.244	10.4.144.244
246	10.4.144.245/32	10.4.144.245 – 10.4.144.245	10.4.144.245
247	10.4.144.246/32	10.4.144.246 – 10.4.144.246	10.4.144.246
248	10.4.144.247/32	10.4.144.247 – 10.4.144.247	10.4.144.247
249	10.4.144.248/32	10.4.144.248 – 10.4.144.248	10.4.144.248
250	10.4.144.249/32	10.4.144.249 – 10.4.144.249	10.4.144.249
251	10.4.144.250/32	10.4.144.250 – 10.4.144.250	10.4.144.250
252	10.4.144.251/32	10.4.144.251 – 10.4.144.251	10.4.144.251
253	10.4.144.252/32	10.4.144.252 – 10.4.144.252	10.4.144.252
254	10.4.144.253/32	10.4.144.253 – 10.4.144.253	10.4.144.253
255	10.4.144.254/32	10.4.144.254 – 10.4.144.254	10.4.144.254
256	10.4.144.255/32	10.4.144.255 – 10.4.144.255	10.4.144.255

showing 256 of 4,096

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