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)10.0.145.0/25

network10.0.145.0/25

broadcast10.0.145.127

first host10.0.145.1

last host10.0.145.126

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.0.145.0/25

address00001010.00000000.10010001.00000000

subnet mask11111111.11111111.11111111.10000000

network00001010.00000000.10010001.00000000

broadcast00001010.00000000.10010001.01111111

green = network part, grey = host part

hex0x0a009100

decimal167809280

reverse dns0.145.0.10.in-addr.arpa

ipv4-mapped::ffff:a00:9100

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.0.145.0/32	10.0.145.0 – 10.0.145.0	10.0.145.0
2	10.0.145.1/32	10.0.145.1 – 10.0.145.1	10.0.145.1
3	10.0.145.2/32	10.0.145.2 – 10.0.145.2	10.0.145.2
4	10.0.145.3/32	10.0.145.3 – 10.0.145.3	10.0.145.3
5	10.0.145.4/32	10.0.145.4 – 10.0.145.4	10.0.145.4
6	10.0.145.5/32	10.0.145.5 – 10.0.145.5	10.0.145.5
7	10.0.145.6/32	10.0.145.6 – 10.0.145.6	10.0.145.6
8	10.0.145.7/32	10.0.145.7 – 10.0.145.7	10.0.145.7
9	10.0.145.8/32	10.0.145.8 – 10.0.145.8	10.0.145.8
10	10.0.145.9/32	10.0.145.9 – 10.0.145.9	10.0.145.9
11	10.0.145.10/32	10.0.145.10 – 10.0.145.10	10.0.145.10
12	10.0.145.11/32	10.0.145.11 – 10.0.145.11	10.0.145.11
13	10.0.145.12/32	10.0.145.12 – 10.0.145.12	10.0.145.12
14	10.0.145.13/32	10.0.145.13 – 10.0.145.13	10.0.145.13
15	10.0.145.14/32	10.0.145.14 – 10.0.145.14	10.0.145.14
16	10.0.145.15/32	10.0.145.15 – 10.0.145.15	10.0.145.15
17	10.0.145.16/32	10.0.145.16 – 10.0.145.16	10.0.145.16
18	10.0.145.17/32	10.0.145.17 – 10.0.145.17	10.0.145.17
19	10.0.145.18/32	10.0.145.18 – 10.0.145.18	10.0.145.18
20	10.0.145.19/32	10.0.145.19 – 10.0.145.19	10.0.145.19
21	10.0.145.20/32	10.0.145.20 – 10.0.145.20	10.0.145.20
22	10.0.145.21/32	10.0.145.21 – 10.0.145.21	10.0.145.21
23	10.0.145.22/32	10.0.145.22 – 10.0.145.22	10.0.145.22
24	10.0.145.23/32	10.0.145.23 – 10.0.145.23	10.0.145.23
25	10.0.145.24/32	10.0.145.24 – 10.0.145.24	10.0.145.24
26	10.0.145.25/32	10.0.145.25 – 10.0.145.25	10.0.145.25
27	10.0.145.26/32	10.0.145.26 – 10.0.145.26	10.0.145.26
28	10.0.145.27/32	10.0.145.27 – 10.0.145.27	10.0.145.27
29	10.0.145.28/32	10.0.145.28 – 10.0.145.28	10.0.145.28
30	10.0.145.29/32	10.0.145.29 – 10.0.145.29	10.0.145.29
31	10.0.145.30/32	10.0.145.30 – 10.0.145.30	10.0.145.30
32	10.0.145.31/32	10.0.145.31 – 10.0.145.31	10.0.145.31
33	10.0.145.32/32	10.0.145.32 – 10.0.145.32	10.0.145.32
34	10.0.145.33/32	10.0.145.33 – 10.0.145.33	10.0.145.33
35	10.0.145.34/32	10.0.145.34 – 10.0.145.34	10.0.145.34
36	10.0.145.35/32	10.0.145.35 – 10.0.145.35	10.0.145.35
37	10.0.145.36/32	10.0.145.36 – 10.0.145.36	10.0.145.36
38	10.0.145.37/32	10.0.145.37 – 10.0.145.37	10.0.145.37
39	10.0.145.38/32	10.0.145.38 – 10.0.145.38	10.0.145.38
40	10.0.145.39/32	10.0.145.39 – 10.0.145.39	10.0.145.39
41	10.0.145.40/32	10.0.145.40 – 10.0.145.40	10.0.145.40
42	10.0.145.41/32	10.0.145.41 – 10.0.145.41	10.0.145.41
43	10.0.145.42/32	10.0.145.42 – 10.0.145.42	10.0.145.42
44	10.0.145.43/32	10.0.145.43 – 10.0.145.43	10.0.145.43
45	10.0.145.44/32	10.0.145.44 – 10.0.145.44	10.0.145.44
46	10.0.145.45/32	10.0.145.45 – 10.0.145.45	10.0.145.45
47	10.0.145.46/32	10.0.145.46 – 10.0.145.46	10.0.145.46
48	10.0.145.47/32	10.0.145.47 – 10.0.145.47	10.0.145.47
49	10.0.145.48/32	10.0.145.48 – 10.0.145.48	10.0.145.48
50	10.0.145.49/32	10.0.145.49 – 10.0.145.49	10.0.145.49
51	10.0.145.50/32	10.0.145.50 – 10.0.145.50	10.0.145.50
52	10.0.145.51/32	10.0.145.51 – 10.0.145.51	10.0.145.51
53	10.0.145.52/32	10.0.145.52 – 10.0.145.52	10.0.145.52
54	10.0.145.53/32	10.0.145.53 – 10.0.145.53	10.0.145.53
55	10.0.145.54/32	10.0.145.54 – 10.0.145.54	10.0.145.54
56	10.0.145.55/32	10.0.145.55 – 10.0.145.55	10.0.145.55
57	10.0.145.56/32	10.0.145.56 – 10.0.145.56	10.0.145.56
58	10.0.145.57/32	10.0.145.57 – 10.0.145.57	10.0.145.57
59	10.0.145.58/32	10.0.145.58 – 10.0.145.58	10.0.145.58
60	10.0.145.59/32	10.0.145.59 – 10.0.145.59	10.0.145.59
61	10.0.145.60/32	10.0.145.60 – 10.0.145.60	10.0.145.60
62	10.0.145.61/32	10.0.145.61 – 10.0.145.61	10.0.145.61
63	10.0.145.62/32	10.0.145.62 – 10.0.145.62	10.0.145.62
64	10.0.145.63/32	10.0.145.63 – 10.0.145.63	10.0.145.63
65	10.0.145.64/32	10.0.145.64 – 10.0.145.64	10.0.145.64
66	10.0.145.65/32	10.0.145.65 – 10.0.145.65	10.0.145.65
67	10.0.145.66/32	10.0.145.66 – 10.0.145.66	10.0.145.66
68	10.0.145.67/32	10.0.145.67 – 10.0.145.67	10.0.145.67
69	10.0.145.68/32	10.0.145.68 – 10.0.145.68	10.0.145.68
70	10.0.145.69/32	10.0.145.69 – 10.0.145.69	10.0.145.69
71	10.0.145.70/32	10.0.145.70 – 10.0.145.70	10.0.145.70
72	10.0.145.71/32	10.0.145.71 – 10.0.145.71	10.0.145.71
73	10.0.145.72/32	10.0.145.72 – 10.0.145.72	10.0.145.72
74	10.0.145.73/32	10.0.145.73 – 10.0.145.73	10.0.145.73
75	10.0.145.74/32	10.0.145.74 – 10.0.145.74	10.0.145.74
76	10.0.145.75/32	10.0.145.75 – 10.0.145.75	10.0.145.75
77	10.0.145.76/32	10.0.145.76 – 10.0.145.76	10.0.145.76
78	10.0.145.77/32	10.0.145.77 – 10.0.145.77	10.0.145.77
79	10.0.145.78/32	10.0.145.78 – 10.0.145.78	10.0.145.78
80	10.0.145.79/32	10.0.145.79 – 10.0.145.79	10.0.145.79
81	10.0.145.80/32	10.0.145.80 – 10.0.145.80	10.0.145.80
82	10.0.145.81/32	10.0.145.81 – 10.0.145.81	10.0.145.81
83	10.0.145.82/32	10.0.145.82 – 10.0.145.82	10.0.145.82
84	10.0.145.83/32	10.0.145.83 – 10.0.145.83	10.0.145.83
85	10.0.145.84/32	10.0.145.84 – 10.0.145.84	10.0.145.84
86	10.0.145.85/32	10.0.145.85 – 10.0.145.85	10.0.145.85
87	10.0.145.86/32	10.0.145.86 – 10.0.145.86	10.0.145.86
88	10.0.145.87/32	10.0.145.87 – 10.0.145.87	10.0.145.87
89	10.0.145.88/32	10.0.145.88 – 10.0.145.88	10.0.145.88
90	10.0.145.89/32	10.0.145.89 – 10.0.145.89	10.0.145.89
91	10.0.145.90/32	10.0.145.90 – 10.0.145.90	10.0.145.90
92	10.0.145.91/32	10.0.145.91 – 10.0.145.91	10.0.145.91
93	10.0.145.92/32	10.0.145.92 – 10.0.145.92	10.0.145.92
94	10.0.145.93/32	10.0.145.93 – 10.0.145.93	10.0.145.93
95	10.0.145.94/32	10.0.145.94 – 10.0.145.94	10.0.145.94
96	10.0.145.95/32	10.0.145.95 – 10.0.145.95	10.0.145.95
97	10.0.145.96/32	10.0.145.96 – 10.0.145.96	10.0.145.96
98	10.0.145.97/32	10.0.145.97 – 10.0.145.97	10.0.145.97
99	10.0.145.98/32	10.0.145.98 – 10.0.145.98	10.0.145.98
100	10.0.145.99/32	10.0.145.99 – 10.0.145.99	10.0.145.99
101	10.0.145.100/32	10.0.145.100 – 10.0.145.100	10.0.145.100
102	10.0.145.101/32	10.0.145.101 – 10.0.145.101	10.0.145.101
103	10.0.145.102/32	10.0.145.102 – 10.0.145.102	10.0.145.102
104	10.0.145.103/32	10.0.145.103 – 10.0.145.103	10.0.145.103
105	10.0.145.104/32	10.0.145.104 – 10.0.145.104	10.0.145.104
106	10.0.145.105/32	10.0.145.105 – 10.0.145.105	10.0.145.105
107	10.0.145.106/32	10.0.145.106 – 10.0.145.106	10.0.145.106
108	10.0.145.107/32	10.0.145.107 – 10.0.145.107	10.0.145.107
109	10.0.145.108/32	10.0.145.108 – 10.0.145.108	10.0.145.108
110	10.0.145.109/32	10.0.145.109 – 10.0.145.109	10.0.145.109
111	10.0.145.110/32	10.0.145.110 – 10.0.145.110	10.0.145.110
112	10.0.145.111/32	10.0.145.111 – 10.0.145.111	10.0.145.111
113	10.0.145.112/32	10.0.145.112 – 10.0.145.112	10.0.145.112
114	10.0.145.113/32	10.0.145.113 – 10.0.145.113	10.0.145.113
115	10.0.145.114/32	10.0.145.114 – 10.0.145.114	10.0.145.114
116	10.0.145.115/32	10.0.145.115 – 10.0.145.115	10.0.145.115
117	10.0.145.116/32	10.0.145.116 – 10.0.145.116	10.0.145.116
118	10.0.145.117/32	10.0.145.117 – 10.0.145.117	10.0.145.117
119	10.0.145.118/32	10.0.145.118 – 10.0.145.118	10.0.145.118
120	10.0.145.119/32	10.0.145.119 – 10.0.145.119	10.0.145.119
121	10.0.145.120/32	10.0.145.120 – 10.0.145.120	10.0.145.120
122	10.0.145.121/32	10.0.145.121 – 10.0.145.121	10.0.145.121
123	10.0.145.122/32	10.0.145.122 – 10.0.145.122	10.0.145.122
124	10.0.145.123/32	10.0.145.123 – 10.0.145.123	10.0.145.123
125	10.0.145.124/32	10.0.145.124 – 10.0.145.124	10.0.145.124
126	10.0.145.125/32	10.0.145.125 – 10.0.145.125	10.0.145.125
127	10.0.145.126/32	10.0.145.126 – 10.0.145.126	10.0.145.126
128	10.0.145.127/32	10.0.145.127 – 10.0.145.127	10.0.145.127

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 →