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)10.2.223.0/25

network10.2.223.0/25

broadcast10.2.223.127

first host10.2.223.1

last host10.2.223.126

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.2.223.0/25

address00001010.00000010.11011111.00000000

subnet mask11111111.11111111.11111111.10000000

network00001010.00000010.11011111.00000000

broadcast00001010.00000010.11011111.01111111

green = network part, grey = host part

hex0x0a02df00

decimal167960320

reverse dns0.223.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:df00

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.2.223.0/32	10.2.223.0 – 10.2.223.0	10.2.223.0
2	10.2.223.1/32	10.2.223.1 – 10.2.223.1	10.2.223.1
3	10.2.223.2/32	10.2.223.2 – 10.2.223.2	10.2.223.2
4	10.2.223.3/32	10.2.223.3 – 10.2.223.3	10.2.223.3
5	10.2.223.4/32	10.2.223.4 – 10.2.223.4	10.2.223.4
6	10.2.223.5/32	10.2.223.5 – 10.2.223.5	10.2.223.5
7	10.2.223.6/32	10.2.223.6 – 10.2.223.6	10.2.223.6
8	10.2.223.7/32	10.2.223.7 – 10.2.223.7	10.2.223.7
9	10.2.223.8/32	10.2.223.8 – 10.2.223.8	10.2.223.8
10	10.2.223.9/32	10.2.223.9 – 10.2.223.9	10.2.223.9
11	10.2.223.10/32	10.2.223.10 – 10.2.223.10	10.2.223.10
12	10.2.223.11/32	10.2.223.11 – 10.2.223.11	10.2.223.11
13	10.2.223.12/32	10.2.223.12 – 10.2.223.12	10.2.223.12
14	10.2.223.13/32	10.2.223.13 – 10.2.223.13	10.2.223.13
15	10.2.223.14/32	10.2.223.14 – 10.2.223.14	10.2.223.14
16	10.2.223.15/32	10.2.223.15 – 10.2.223.15	10.2.223.15
17	10.2.223.16/32	10.2.223.16 – 10.2.223.16	10.2.223.16
18	10.2.223.17/32	10.2.223.17 – 10.2.223.17	10.2.223.17
19	10.2.223.18/32	10.2.223.18 – 10.2.223.18	10.2.223.18
20	10.2.223.19/32	10.2.223.19 – 10.2.223.19	10.2.223.19
21	10.2.223.20/32	10.2.223.20 – 10.2.223.20	10.2.223.20
22	10.2.223.21/32	10.2.223.21 – 10.2.223.21	10.2.223.21
23	10.2.223.22/32	10.2.223.22 – 10.2.223.22	10.2.223.22
24	10.2.223.23/32	10.2.223.23 – 10.2.223.23	10.2.223.23
25	10.2.223.24/32	10.2.223.24 – 10.2.223.24	10.2.223.24
26	10.2.223.25/32	10.2.223.25 – 10.2.223.25	10.2.223.25
27	10.2.223.26/32	10.2.223.26 – 10.2.223.26	10.2.223.26
28	10.2.223.27/32	10.2.223.27 – 10.2.223.27	10.2.223.27
29	10.2.223.28/32	10.2.223.28 – 10.2.223.28	10.2.223.28
30	10.2.223.29/32	10.2.223.29 – 10.2.223.29	10.2.223.29
31	10.2.223.30/32	10.2.223.30 – 10.2.223.30	10.2.223.30
32	10.2.223.31/32	10.2.223.31 – 10.2.223.31	10.2.223.31
33	10.2.223.32/32	10.2.223.32 – 10.2.223.32	10.2.223.32
34	10.2.223.33/32	10.2.223.33 – 10.2.223.33	10.2.223.33
35	10.2.223.34/32	10.2.223.34 – 10.2.223.34	10.2.223.34
36	10.2.223.35/32	10.2.223.35 – 10.2.223.35	10.2.223.35
37	10.2.223.36/32	10.2.223.36 – 10.2.223.36	10.2.223.36
38	10.2.223.37/32	10.2.223.37 – 10.2.223.37	10.2.223.37
39	10.2.223.38/32	10.2.223.38 – 10.2.223.38	10.2.223.38
40	10.2.223.39/32	10.2.223.39 – 10.2.223.39	10.2.223.39
41	10.2.223.40/32	10.2.223.40 – 10.2.223.40	10.2.223.40
42	10.2.223.41/32	10.2.223.41 – 10.2.223.41	10.2.223.41
43	10.2.223.42/32	10.2.223.42 – 10.2.223.42	10.2.223.42
44	10.2.223.43/32	10.2.223.43 – 10.2.223.43	10.2.223.43
45	10.2.223.44/32	10.2.223.44 – 10.2.223.44	10.2.223.44
46	10.2.223.45/32	10.2.223.45 – 10.2.223.45	10.2.223.45
47	10.2.223.46/32	10.2.223.46 – 10.2.223.46	10.2.223.46
48	10.2.223.47/32	10.2.223.47 – 10.2.223.47	10.2.223.47
49	10.2.223.48/32	10.2.223.48 – 10.2.223.48	10.2.223.48
50	10.2.223.49/32	10.2.223.49 – 10.2.223.49	10.2.223.49
51	10.2.223.50/32	10.2.223.50 – 10.2.223.50	10.2.223.50
52	10.2.223.51/32	10.2.223.51 – 10.2.223.51	10.2.223.51
53	10.2.223.52/32	10.2.223.52 – 10.2.223.52	10.2.223.52
54	10.2.223.53/32	10.2.223.53 – 10.2.223.53	10.2.223.53
55	10.2.223.54/32	10.2.223.54 – 10.2.223.54	10.2.223.54
56	10.2.223.55/32	10.2.223.55 – 10.2.223.55	10.2.223.55
57	10.2.223.56/32	10.2.223.56 – 10.2.223.56	10.2.223.56
58	10.2.223.57/32	10.2.223.57 – 10.2.223.57	10.2.223.57
59	10.2.223.58/32	10.2.223.58 – 10.2.223.58	10.2.223.58
60	10.2.223.59/32	10.2.223.59 – 10.2.223.59	10.2.223.59
61	10.2.223.60/32	10.2.223.60 – 10.2.223.60	10.2.223.60
62	10.2.223.61/32	10.2.223.61 – 10.2.223.61	10.2.223.61
63	10.2.223.62/32	10.2.223.62 – 10.2.223.62	10.2.223.62
64	10.2.223.63/32	10.2.223.63 – 10.2.223.63	10.2.223.63
65	10.2.223.64/32	10.2.223.64 – 10.2.223.64	10.2.223.64
66	10.2.223.65/32	10.2.223.65 – 10.2.223.65	10.2.223.65
67	10.2.223.66/32	10.2.223.66 – 10.2.223.66	10.2.223.66
68	10.2.223.67/32	10.2.223.67 – 10.2.223.67	10.2.223.67
69	10.2.223.68/32	10.2.223.68 – 10.2.223.68	10.2.223.68
70	10.2.223.69/32	10.2.223.69 – 10.2.223.69	10.2.223.69
71	10.2.223.70/32	10.2.223.70 – 10.2.223.70	10.2.223.70
72	10.2.223.71/32	10.2.223.71 – 10.2.223.71	10.2.223.71
73	10.2.223.72/32	10.2.223.72 – 10.2.223.72	10.2.223.72
74	10.2.223.73/32	10.2.223.73 – 10.2.223.73	10.2.223.73
75	10.2.223.74/32	10.2.223.74 – 10.2.223.74	10.2.223.74
76	10.2.223.75/32	10.2.223.75 – 10.2.223.75	10.2.223.75
77	10.2.223.76/32	10.2.223.76 – 10.2.223.76	10.2.223.76
78	10.2.223.77/32	10.2.223.77 – 10.2.223.77	10.2.223.77
79	10.2.223.78/32	10.2.223.78 – 10.2.223.78	10.2.223.78
80	10.2.223.79/32	10.2.223.79 – 10.2.223.79	10.2.223.79
81	10.2.223.80/32	10.2.223.80 – 10.2.223.80	10.2.223.80
82	10.2.223.81/32	10.2.223.81 – 10.2.223.81	10.2.223.81
83	10.2.223.82/32	10.2.223.82 – 10.2.223.82	10.2.223.82
84	10.2.223.83/32	10.2.223.83 – 10.2.223.83	10.2.223.83
85	10.2.223.84/32	10.2.223.84 – 10.2.223.84	10.2.223.84
86	10.2.223.85/32	10.2.223.85 – 10.2.223.85	10.2.223.85
87	10.2.223.86/32	10.2.223.86 – 10.2.223.86	10.2.223.86
88	10.2.223.87/32	10.2.223.87 – 10.2.223.87	10.2.223.87
89	10.2.223.88/32	10.2.223.88 – 10.2.223.88	10.2.223.88
90	10.2.223.89/32	10.2.223.89 – 10.2.223.89	10.2.223.89
91	10.2.223.90/32	10.2.223.90 – 10.2.223.90	10.2.223.90
92	10.2.223.91/32	10.2.223.91 – 10.2.223.91	10.2.223.91
93	10.2.223.92/32	10.2.223.92 – 10.2.223.92	10.2.223.92
94	10.2.223.93/32	10.2.223.93 – 10.2.223.93	10.2.223.93
95	10.2.223.94/32	10.2.223.94 – 10.2.223.94	10.2.223.94
96	10.2.223.95/32	10.2.223.95 – 10.2.223.95	10.2.223.95
97	10.2.223.96/32	10.2.223.96 – 10.2.223.96	10.2.223.96
98	10.2.223.97/32	10.2.223.97 – 10.2.223.97	10.2.223.97
99	10.2.223.98/32	10.2.223.98 – 10.2.223.98	10.2.223.98
100	10.2.223.99/32	10.2.223.99 – 10.2.223.99	10.2.223.99
101	10.2.223.100/32	10.2.223.100 – 10.2.223.100	10.2.223.100
102	10.2.223.101/32	10.2.223.101 – 10.2.223.101	10.2.223.101
103	10.2.223.102/32	10.2.223.102 – 10.2.223.102	10.2.223.102
104	10.2.223.103/32	10.2.223.103 – 10.2.223.103	10.2.223.103
105	10.2.223.104/32	10.2.223.104 – 10.2.223.104	10.2.223.104
106	10.2.223.105/32	10.2.223.105 – 10.2.223.105	10.2.223.105
107	10.2.223.106/32	10.2.223.106 – 10.2.223.106	10.2.223.106
108	10.2.223.107/32	10.2.223.107 – 10.2.223.107	10.2.223.107
109	10.2.223.108/32	10.2.223.108 – 10.2.223.108	10.2.223.108
110	10.2.223.109/32	10.2.223.109 – 10.2.223.109	10.2.223.109
111	10.2.223.110/32	10.2.223.110 – 10.2.223.110	10.2.223.110
112	10.2.223.111/32	10.2.223.111 – 10.2.223.111	10.2.223.111
113	10.2.223.112/32	10.2.223.112 – 10.2.223.112	10.2.223.112
114	10.2.223.113/32	10.2.223.113 – 10.2.223.113	10.2.223.113
115	10.2.223.114/32	10.2.223.114 – 10.2.223.114	10.2.223.114
116	10.2.223.115/32	10.2.223.115 – 10.2.223.115	10.2.223.115
117	10.2.223.116/32	10.2.223.116 – 10.2.223.116	10.2.223.116
118	10.2.223.117/32	10.2.223.117 – 10.2.223.117	10.2.223.117
119	10.2.223.118/32	10.2.223.118 – 10.2.223.118	10.2.223.118
120	10.2.223.119/32	10.2.223.119 – 10.2.223.119	10.2.223.119
121	10.2.223.120/32	10.2.223.120 – 10.2.223.120	10.2.223.120
122	10.2.223.121/32	10.2.223.121 – 10.2.223.121	10.2.223.121
123	10.2.223.122/32	10.2.223.122 – 10.2.223.122	10.2.223.122
124	10.2.223.123/32	10.2.223.123 – 10.2.223.123	10.2.223.123
125	10.2.223.124/32	10.2.223.124 – 10.2.223.124	10.2.223.124
126	10.2.223.125/32	10.2.223.125 – 10.2.223.125	10.2.223.125
127	10.2.223.126/32	10.2.223.126 – 10.2.223.126	10.2.223.126
128	10.2.223.127/32	10.2.223.127 – 10.2.223.127	10.2.223.127

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