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)10.45.99.0/24

network10.45.99.0/24

broadcast10.45.99.255

first host10.45.99.1

last host10.45.99.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.45.99.0/24

address00001010.00101101.01100011.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.00101101.01100011.00000000

broadcast00001010.00101101.01100011.11111111

green = network part, grey = host part

hex0x0a2d6300

decimal170746624

reverse dns0.99.45.10.in-addr.arpa

ipv4-mapped::ffff:a2d:6300

/24 split into /31 · 128 subnets

close ×

#	network	host range	broadcast
1	10.45.99.0/31	10.45.99.0 – 10.45.99.1	10.45.99.1
2	10.45.99.2/31	10.45.99.2 – 10.45.99.3	10.45.99.3
3	10.45.99.4/31	10.45.99.4 – 10.45.99.5	10.45.99.5
4	10.45.99.6/31	10.45.99.6 – 10.45.99.7	10.45.99.7
5	10.45.99.8/31	10.45.99.8 – 10.45.99.9	10.45.99.9
6	10.45.99.10/31	10.45.99.10 – 10.45.99.11	10.45.99.11
7	10.45.99.12/31	10.45.99.12 – 10.45.99.13	10.45.99.13
8	10.45.99.14/31	10.45.99.14 – 10.45.99.15	10.45.99.15
9	10.45.99.16/31	10.45.99.16 – 10.45.99.17	10.45.99.17
10	10.45.99.18/31	10.45.99.18 – 10.45.99.19	10.45.99.19
11	10.45.99.20/31	10.45.99.20 – 10.45.99.21	10.45.99.21
12	10.45.99.22/31	10.45.99.22 – 10.45.99.23	10.45.99.23
13	10.45.99.24/31	10.45.99.24 – 10.45.99.25	10.45.99.25
14	10.45.99.26/31	10.45.99.26 – 10.45.99.27	10.45.99.27
15	10.45.99.28/31	10.45.99.28 – 10.45.99.29	10.45.99.29
16	10.45.99.30/31	10.45.99.30 – 10.45.99.31	10.45.99.31
17	10.45.99.32/31	10.45.99.32 – 10.45.99.33	10.45.99.33
18	10.45.99.34/31	10.45.99.34 – 10.45.99.35	10.45.99.35
19	10.45.99.36/31	10.45.99.36 – 10.45.99.37	10.45.99.37
20	10.45.99.38/31	10.45.99.38 – 10.45.99.39	10.45.99.39
21	10.45.99.40/31	10.45.99.40 – 10.45.99.41	10.45.99.41
22	10.45.99.42/31	10.45.99.42 – 10.45.99.43	10.45.99.43
23	10.45.99.44/31	10.45.99.44 – 10.45.99.45	10.45.99.45
24	10.45.99.46/31	10.45.99.46 – 10.45.99.47	10.45.99.47
25	10.45.99.48/31	10.45.99.48 – 10.45.99.49	10.45.99.49
26	10.45.99.50/31	10.45.99.50 – 10.45.99.51	10.45.99.51
27	10.45.99.52/31	10.45.99.52 – 10.45.99.53	10.45.99.53
28	10.45.99.54/31	10.45.99.54 – 10.45.99.55	10.45.99.55
29	10.45.99.56/31	10.45.99.56 – 10.45.99.57	10.45.99.57
30	10.45.99.58/31	10.45.99.58 – 10.45.99.59	10.45.99.59
31	10.45.99.60/31	10.45.99.60 – 10.45.99.61	10.45.99.61
32	10.45.99.62/31	10.45.99.62 – 10.45.99.63	10.45.99.63
33	10.45.99.64/31	10.45.99.64 – 10.45.99.65	10.45.99.65
34	10.45.99.66/31	10.45.99.66 – 10.45.99.67	10.45.99.67
35	10.45.99.68/31	10.45.99.68 – 10.45.99.69	10.45.99.69
36	10.45.99.70/31	10.45.99.70 – 10.45.99.71	10.45.99.71
37	10.45.99.72/31	10.45.99.72 – 10.45.99.73	10.45.99.73
38	10.45.99.74/31	10.45.99.74 – 10.45.99.75	10.45.99.75
39	10.45.99.76/31	10.45.99.76 – 10.45.99.77	10.45.99.77
40	10.45.99.78/31	10.45.99.78 – 10.45.99.79	10.45.99.79
41	10.45.99.80/31	10.45.99.80 – 10.45.99.81	10.45.99.81
42	10.45.99.82/31	10.45.99.82 – 10.45.99.83	10.45.99.83
43	10.45.99.84/31	10.45.99.84 – 10.45.99.85	10.45.99.85
44	10.45.99.86/31	10.45.99.86 – 10.45.99.87	10.45.99.87
45	10.45.99.88/31	10.45.99.88 – 10.45.99.89	10.45.99.89
46	10.45.99.90/31	10.45.99.90 – 10.45.99.91	10.45.99.91
47	10.45.99.92/31	10.45.99.92 – 10.45.99.93	10.45.99.93
48	10.45.99.94/31	10.45.99.94 – 10.45.99.95	10.45.99.95
49	10.45.99.96/31	10.45.99.96 – 10.45.99.97	10.45.99.97
50	10.45.99.98/31	10.45.99.98 – 10.45.99.99	10.45.99.99
51	10.45.99.100/31	10.45.99.100 – 10.45.99.101	10.45.99.101
52	10.45.99.102/31	10.45.99.102 – 10.45.99.103	10.45.99.103
53	10.45.99.104/31	10.45.99.104 – 10.45.99.105	10.45.99.105
54	10.45.99.106/31	10.45.99.106 – 10.45.99.107	10.45.99.107
55	10.45.99.108/31	10.45.99.108 – 10.45.99.109	10.45.99.109
56	10.45.99.110/31	10.45.99.110 – 10.45.99.111	10.45.99.111
57	10.45.99.112/31	10.45.99.112 – 10.45.99.113	10.45.99.113
58	10.45.99.114/31	10.45.99.114 – 10.45.99.115	10.45.99.115
59	10.45.99.116/31	10.45.99.116 – 10.45.99.117	10.45.99.117
60	10.45.99.118/31	10.45.99.118 – 10.45.99.119	10.45.99.119
61	10.45.99.120/31	10.45.99.120 – 10.45.99.121	10.45.99.121
62	10.45.99.122/31	10.45.99.122 – 10.45.99.123	10.45.99.123
63	10.45.99.124/31	10.45.99.124 – 10.45.99.125	10.45.99.125
64	10.45.99.126/31	10.45.99.126 – 10.45.99.127	10.45.99.127
65	10.45.99.128/31	10.45.99.128 – 10.45.99.129	10.45.99.129
66	10.45.99.130/31	10.45.99.130 – 10.45.99.131	10.45.99.131
67	10.45.99.132/31	10.45.99.132 – 10.45.99.133	10.45.99.133
68	10.45.99.134/31	10.45.99.134 – 10.45.99.135	10.45.99.135
69	10.45.99.136/31	10.45.99.136 – 10.45.99.137	10.45.99.137
70	10.45.99.138/31	10.45.99.138 – 10.45.99.139	10.45.99.139
71	10.45.99.140/31	10.45.99.140 – 10.45.99.141	10.45.99.141
72	10.45.99.142/31	10.45.99.142 – 10.45.99.143	10.45.99.143
73	10.45.99.144/31	10.45.99.144 – 10.45.99.145	10.45.99.145
74	10.45.99.146/31	10.45.99.146 – 10.45.99.147	10.45.99.147
75	10.45.99.148/31	10.45.99.148 – 10.45.99.149	10.45.99.149
76	10.45.99.150/31	10.45.99.150 – 10.45.99.151	10.45.99.151
77	10.45.99.152/31	10.45.99.152 – 10.45.99.153	10.45.99.153
78	10.45.99.154/31	10.45.99.154 – 10.45.99.155	10.45.99.155
79	10.45.99.156/31	10.45.99.156 – 10.45.99.157	10.45.99.157
80	10.45.99.158/31	10.45.99.158 – 10.45.99.159	10.45.99.159
81	10.45.99.160/31	10.45.99.160 – 10.45.99.161	10.45.99.161
82	10.45.99.162/31	10.45.99.162 – 10.45.99.163	10.45.99.163
83	10.45.99.164/31	10.45.99.164 – 10.45.99.165	10.45.99.165
84	10.45.99.166/31	10.45.99.166 – 10.45.99.167	10.45.99.167
85	10.45.99.168/31	10.45.99.168 – 10.45.99.169	10.45.99.169
86	10.45.99.170/31	10.45.99.170 – 10.45.99.171	10.45.99.171
87	10.45.99.172/31	10.45.99.172 – 10.45.99.173	10.45.99.173
88	10.45.99.174/31	10.45.99.174 – 10.45.99.175	10.45.99.175
89	10.45.99.176/31	10.45.99.176 – 10.45.99.177	10.45.99.177
90	10.45.99.178/31	10.45.99.178 – 10.45.99.179	10.45.99.179
91	10.45.99.180/31	10.45.99.180 – 10.45.99.181	10.45.99.181
92	10.45.99.182/31	10.45.99.182 – 10.45.99.183	10.45.99.183
93	10.45.99.184/31	10.45.99.184 – 10.45.99.185	10.45.99.185
94	10.45.99.186/31	10.45.99.186 – 10.45.99.187	10.45.99.187
95	10.45.99.188/31	10.45.99.188 – 10.45.99.189	10.45.99.189
96	10.45.99.190/31	10.45.99.190 – 10.45.99.191	10.45.99.191
97	10.45.99.192/31	10.45.99.192 – 10.45.99.193	10.45.99.193
98	10.45.99.194/31	10.45.99.194 – 10.45.99.195	10.45.99.195
99	10.45.99.196/31	10.45.99.196 – 10.45.99.197	10.45.99.197
100	10.45.99.198/31	10.45.99.198 – 10.45.99.199	10.45.99.199
101	10.45.99.200/31	10.45.99.200 – 10.45.99.201	10.45.99.201
102	10.45.99.202/31	10.45.99.202 – 10.45.99.203	10.45.99.203
103	10.45.99.204/31	10.45.99.204 – 10.45.99.205	10.45.99.205
104	10.45.99.206/31	10.45.99.206 – 10.45.99.207	10.45.99.207
105	10.45.99.208/31	10.45.99.208 – 10.45.99.209	10.45.99.209
106	10.45.99.210/31	10.45.99.210 – 10.45.99.211	10.45.99.211
107	10.45.99.212/31	10.45.99.212 – 10.45.99.213	10.45.99.213
108	10.45.99.214/31	10.45.99.214 – 10.45.99.215	10.45.99.215
109	10.45.99.216/31	10.45.99.216 – 10.45.99.217	10.45.99.217
110	10.45.99.218/31	10.45.99.218 – 10.45.99.219	10.45.99.219
111	10.45.99.220/31	10.45.99.220 – 10.45.99.221	10.45.99.221
112	10.45.99.222/31	10.45.99.222 – 10.45.99.223	10.45.99.223
113	10.45.99.224/31	10.45.99.224 – 10.45.99.225	10.45.99.225
114	10.45.99.226/31	10.45.99.226 – 10.45.99.227	10.45.99.227
115	10.45.99.228/31	10.45.99.228 – 10.45.99.229	10.45.99.229
116	10.45.99.230/31	10.45.99.230 – 10.45.99.231	10.45.99.231
117	10.45.99.232/31	10.45.99.232 – 10.45.99.233	10.45.99.233
118	10.45.99.234/31	10.45.99.234 – 10.45.99.235	10.45.99.235
119	10.45.99.236/31	10.45.99.236 – 10.45.99.237	10.45.99.237
120	10.45.99.238/31	10.45.99.238 – 10.45.99.239	10.45.99.239
121	10.45.99.240/31	10.45.99.240 – 10.45.99.241	10.45.99.241
122	10.45.99.242/31	10.45.99.242 – 10.45.99.243	10.45.99.243
123	10.45.99.244/31	10.45.99.244 – 10.45.99.245	10.45.99.245
124	10.45.99.246/31	10.45.99.246 – 10.45.99.247	10.45.99.247
125	10.45.99.248/31	10.45.99.248 – 10.45.99.249	10.45.99.249
126	10.45.99.250/31	10.45.99.250 – 10.45.99.251	10.45.99.251
127	10.45.99.252/31	10.45.99.252 – 10.45.99.253	10.45.99.253
128	10.45.99.254/31	10.45.99.254 – 10.45.99.255	10.45.99.255

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 /24
/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	-
/24	255.255.255.0	256	254	1
/25	255.255.255.128	128	126	2 split →
/26	255.255.255.192	64	62	4 split →
/27	255.255.255.224	32	30	8 split →
/28	255.255.255.240	16	14	16 split →
/29	255.255.255.248	8	6	32 split →
/30	255.255.255.252	4	2	64 split →
/31	255.255.255.254	2	2	128 split →
/32	255.255.255.255	1	1	256 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 →