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)10.76.100.0/23

network10.76.100.0/23

broadcast10.76.101.255

first host10.76.100.1

last host10.76.101.254

subnet mask255.255.254.0

wildcard0.0.1.255

addresses512

usable hosts510

classA

ipcalc 10.76.100.0/23

address00001010.01001100.01100100.00000000

subnet mask11111111.11111111.11111110.00000000

network00001010.01001100.01100100.00000000

broadcast00001010.01001100.01100101.11111111

green = network part, grey = host part

hex0x0a4c6400

decimal172778496

reverse dns0.100.76.10.in-addr.arpa

ipv4-mapped::ffff:a4c:6400

/23 split into /30 · 128 subnets

close ×

#	network	host range	broadcast
1	10.76.100.0/30	10.76.100.1 – 10.76.100.2	10.76.100.3
2	10.76.100.4/30	10.76.100.5 – 10.76.100.6	10.76.100.7
3	10.76.100.8/30	10.76.100.9 – 10.76.100.10	10.76.100.11
4	10.76.100.12/30	10.76.100.13 – 10.76.100.14	10.76.100.15
5	10.76.100.16/30	10.76.100.17 – 10.76.100.18	10.76.100.19
6	10.76.100.20/30	10.76.100.21 – 10.76.100.22	10.76.100.23
7	10.76.100.24/30	10.76.100.25 – 10.76.100.26	10.76.100.27
8	10.76.100.28/30	10.76.100.29 – 10.76.100.30	10.76.100.31
9	10.76.100.32/30	10.76.100.33 – 10.76.100.34	10.76.100.35
10	10.76.100.36/30	10.76.100.37 – 10.76.100.38	10.76.100.39
11	10.76.100.40/30	10.76.100.41 – 10.76.100.42	10.76.100.43
12	10.76.100.44/30	10.76.100.45 – 10.76.100.46	10.76.100.47
13	10.76.100.48/30	10.76.100.49 – 10.76.100.50	10.76.100.51
14	10.76.100.52/30	10.76.100.53 – 10.76.100.54	10.76.100.55
15	10.76.100.56/30	10.76.100.57 – 10.76.100.58	10.76.100.59
16	10.76.100.60/30	10.76.100.61 – 10.76.100.62	10.76.100.63
17	10.76.100.64/30	10.76.100.65 – 10.76.100.66	10.76.100.67
18	10.76.100.68/30	10.76.100.69 – 10.76.100.70	10.76.100.71
19	10.76.100.72/30	10.76.100.73 – 10.76.100.74	10.76.100.75
20	10.76.100.76/30	10.76.100.77 – 10.76.100.78	10.76.100.79
21	10.76.100.80/30	10.76.100.81 – 10.76.100.82	10.76.100.83
22	10.76.100.84/30	10.76.100.85 – 10.76.100.86	10.76.100.87
23	10.76.100.88/30	10.76.100.89 – 10.76.100.90	10.76.100.91
24	10.76.100.92/30	10.76.100.93 – 10.76.100.94	10.76.100.95
25	10.76.100.96/30	10.76.100.97 – 10.76.100.98	10.76.100.99
26	10.76.100.100/30	10.76.100.101 – 10.76.100.102	10.76.100.103
27	10.76.100.104/30	10.76.100.105 – 10.76.100.106	10.76.100.107
28	10.76.100.108/30	10.76.100.109 – 10.76.100.110	10.76.100.111
29	10.76.100.112/30	10.76.100.113 – 10.76.100.114	10.76.100.115
30	10.76.100.116/30	10.76.100.117 – 10.76.100.118	10.76.100.119
31	10.76.100.120/30	10.76.100.121 – 10.76.100.122	10.76.100.123
32	10.76.100.124/30	10.76.100.125 – 10.76.100.126	10.76.100.127
33	10.76.100.128/30	10.76.100.129 – 10.76.100.130	10.76.100.131
34	10.76.100.132/30	10.76.100.133 – 10.76.100.134	10.76.100.135
35	10.76.100.136/30	10.76.100.137 – 10.76.100.138	10.76.100.139
36	10.76.100.140/30	10.76.100.141 – 10.76.100.142	10.76.100.143
37	10.76.100.144/30	10.76.100.145 – 10.76.100.146	10.76.100.147
38	10.76.100.148/30	10.76.100.149 – 10.76.100.150	10.76.100.151
39	10.76.100.152/30	10.76.100.153 – 10.76.100.154	10.76.100.155
40	10.76.100.156/30	10.76.100.157 – 10.76.100.158	10.76.100.159
41	10.76.100.160/30	10.76.100.161 – 10.76.100.162	10.76.100.163
42	10.76.100.164/30	10.76.100.165 – 10.76.100.166	10.76.100.167
43	10.76.100.168/30	10.76.100.169 – 10.76.100.170	10.76.100.171
44	10.76.100.172/30	10.76.100.173 – 10.76.100.174	10.76.100.175
45	10.76.100.176/30	10.76.100.177 – 10.76.100.178	10.76.100.179
46	10.76.100.180/30	10.76.100.181 – 10.76.100.182	10.76.100.183
47	10.76.100.184/30	10.76.100.185 – 10.76.100.186	10.76.100.187
48	10.76.100.188/30	10.76.100.189 – 10.76.100.190	10.76.100.191
49	10.76.100.192/30	10.76.100.193 – 10.76.100.194	10.76.100.195
50	10.76.100.196/30	10.76.100.197 – 10.76.100.198	10.76.100.199
51	10.76.100.200/30	10.76.100.201 – 10.76.100.202	10.76.100.203
52	10.76.100.204/30	10.76.100.205 – 10.76.100.206	10.76.100.207
53	10.76.100.208/30	10.76.100.209 – 10.76.100.210	10.76.100.211
54	10.76.100.212/30	10.76.100.213 – 10.76.100.214	10.76.100.215
55	10.76.100.216/30	10.76.100.217 – 10.76.100.218	10.76.100.219
56	10.76.100.220/30	10.76.100.221 – 10.76.100.222	10.76.100.223
57	10.76.100.224/30	10.76.100.225 – 10.76.100.226	10.76.100.227
58	10.76.100.228/30	10.76.100.229 – 10.76.100.230	10.76.100.231
59	10.76.100.232/30	10.76.100.233 – 10.76.100.234	10.76.100.235
60	10.76.100.236/30	10.76.100.237 – 10.76.100.238	10.76.100.239
61	10.76.100.240/30	10.76.100.241 – 10.76.100.242	10.76.100.243
62	10.76.100.244/30	10.76.100.245 – 10.76.100.246	10.76.100.247
63	10.76.100.248/30	10.76.100.249 – 10.76.100.250	10.76.100.251
64	10.76.100.252/30	10.76.100.253 – 10.76.100.254	10.76.100.255
65	10.76.101.0/30	10.76.101.1 – 10.76.101.2	10.76.101.3
66	10.76.101.4/30	10.76.101.5 – 10.76.101.6	10.76.101.7
67	10.76.101.8/30	10.76.101.9 – 10.76.101.10	10.76.101.11
68	10.76.101.12/30	10.76.101.13 – 10.76.101.14	10.76.101.15
69	10.76.101.16/30	10.76.101.17 – 10.76.101.18	10.76.101.19
70	10.76.101.20/30	10.76.101.21 – 10.76.101.22	10.76.101.23
71	10.76.101.24/30	10.76.101.25 – 10.76.101.26	10.76.101.27
72	10.76.101.28/30	10.76.101.29 – 10.76.101.30	10.76.101.31
73	10.76.101.32/30	10.76.101.33 – 10.76.101.34	10.76.101.35
74	10.76.101.36/30	10.76.101.37 – 10.76.101.38	10.76.101.39
75	10.76.101.40/30	10.76.101.41 – 10.76.101.42	10.76.101.43
76	10.76.101.44/30	10.76.101.45 – 10.76.101.46	10.76.101.47
77	10.76.101.48/30	10.76.101.49 – 10.76.101.50	10.76.101.51
78	10.76.101.52/30	10.76.101.53 – 10.76.101.54	10.76.101.55
79	10.76.101.56/30	10.76.101.57 – 10.76.101.58	10.76.101.59
80	10.76.101.60/30	10.76.101.61 – 10.76.101.62	10.76.101.63
81	10.76.101.64/30	10.76.101.65 – 10.76.101.66	10.76.101.67
82	10.76.101.68/30	10.76.101.69 – 10.76.101.70	10.76.101.71
83	10.76.101.72/30	10.76.101.73 – 10.76.101.74	10.76.101.75
84	10.76.101.76/30	10.76.101.77 – 10.76.101.78	10.76.101.79
85	10.76.101.80/30	10.76.101.81 – 10.76.101.82	10.76.101.83
86	10.76.101.84/30	10.76.101.85 – 10.76.101.86	10.76.101.87
87	10.76.101.88/30	10.76.101.89 – 10.76.101.90	10.76.101.91
88	10.76.101.92/30	10.76.101.93 – 10.76.101.94	10.76.101.95
89	10.76.101.96/30	10.76.101.97 – 10.76.101.98	10.76.101.99
90	10.76.101.100/30	10.76.101.101 – 10.76.101.102	10.76.101.103
91	10.76.101.104/30	10.76.101.105 – 10.76.101.106	10.76.101.107
92	10.76.101.108/30	10.76.101.109 – 10.76.101.110	10.76.101.111
93	10.76.101.112/30	10.76.101.113 – 10.76.101.114	10.76.101.115
94	10.76.101.116/30	10.76.101.117 – 10.76.101.118	10.76.101.119
95	10.76.101.120/30	10.76.101.121 – 10.76.101.122	10.76.101.123
96	10.76.101.124/30	10.76.101.125 – 10.76.101.126	10.76.101.127
97	10.76.101.128/30	10.76.101.129 – 10.76.101.130	10.76.101.131
98	10.76.101.132/30	10.76.101.133 – 10.76.101.134	10.76.101.135
99	10.76.101.136/30	10.76.101.137 – 10.76.101.138	10.76.101.139
100	10.76.101.140/30	10.76.101.141 – 10.76.101.142	10.76.101.143
101	10.76.101.144/30	10.76.101.145 – 10.76.101.146	10.76.101.147
102	10.76.101.148/30	10.76.101.149 – 10.76.101.150	10.76.101.151
103	10.76.101.152/30	10.76.101.153 – 10.76.101.154	10.76.101.155
104	10.76.101.156/30	10.76.101.157 – 10.76.101.158	10.76.101.159
105	10.76.101.160/30	10.76.101.161 – 10.76.101.162	10.76.101.163
106	10.76.101.164/30	10.76.101.165 – 10.76.101.166	10.76.101.167
107	10.76.101.168/30	10.76.101.169 – 10.76.101.170	10.76.101.171
108	10.76.101.172/30	10.76.101.173 – 10.76.101.174	10.76.101.175
109	10.76.101.176/30	10.76.101.177 – 10.76.101.178	10.76.101.179
110	10.76.101.180/30	10.76.101.181 – 10.76.101.182	10.76.101.183
111	10.76.101.184/30	10.76.101.185 – 10.76.101.186	10.76.101.187
112	10.76.101.188/30	10.76.101.189 – 10.76.101.190	10.76.101.191
113	10.76.101.192/30	10.76.101.193 – 10.76.101.194	10.76.101.195
114	10.76.101.196/30	10.76.101.197 – 10.76.101.198	10.76.101.199
115	10.76.101.200/30	10.76.101.201 – 10.76.101.202	10.76.101.203
116	10.76.101.204/30	10.76.101.205 – 10.76.101.206	10.76.101.207
117	10.76.101.208/30	10.76.101.209 – 10.76.101.210	10.76.101.211
118	10.76.101.212/30	10.76.101.213 – 10.76.101.214	10.76.101.215
119	10.76.101.216/30	10.76.101.217 – 10.76.101.218	10.76.101.219
120	10.76.101.220/30	10.76.101.221 – 10.76.101.222	10.76.101.223
121	10.76.101.224/30	10.76.101.225 – 10.76.101.226	10.76.101.227
122	10.76.101.228/30	10.76.101.229 – 10.76.101.230	10.76.101.231
123	10.76.101.232/30	10.76.101.233 – 10.76.101.234	10.76.101.235
124	10.76.101.236/30	10.76.101.237 – 10.76.101.238	10.76.101.239
125	10.76.101.240/30	10.76.101.241 – 10.76.101.242	10.76.101.243
126	10.76.101.244/30	10.76.101.245 – 10.76.101.246	10.76.101.247
127	10.76.101.248/30	10.76.101.249 – 10.76.101.250	10.76.101.251
128	10.76.101.252/30	10.76.101.253 – 10.76.101.254	10.76.101.255

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 /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 →