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)10.2.250.0/25

network10.2.250.0/25

broadcast10.2.250.127

first host10.2.250.1

last host10.2.250.126

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.2.250.0/25

address00001010.00000010.11111010.00000000

subnet mask11111111.11111111.11111111.10000000

network00001010.00000010.11111010.00000000

broadcast00001010.00000010.11111010.01111111

green = network part, grey = host part

hex0x0a02fa00

decimal167967232

reverse dns0.250.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:fa00

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.2.250.0/32	10.2.250.0 – 10.2.250.0	10.2.250.0
2	10.2.250.1/32	10.2.250.1 – 10.2.250.1	10.2.250.1
3	10.2.250.2/32	10.2.250.2 – 10.2.250.2	10.2.250.2
4	10.2.250.3/32	10.2.250.3 – 10.2.250.3	10.2.250.3
5	10.2.250.4/32	10.2.250.4 – 10.2.250.4	10.2.250.4
6	10.2.250.5/32	10.2.250.5 – 10.2.250.5	10.2.250.5
7	10.2.250.6/32	10.2.250.6 – 10.2.250.6	10.2.250.6
8	10.2.250.7/32	10.2.250.7 – 10.2.250.7	10.2.250.7
9	10.2.250.8/32	10.2.250.8 – 10.2.250.8	10.2.250.8
10	10.2.250.9/32	10.2.250.9 – 10.2.250.9	10.2.250.9
11	10.2.250.10/32	10.2.250.10 – 10.2.250.10	10.2.250.10
12	10.2.250.11/32	10.2.250.11 – 10.2.250.11	10.2.250.11
13	10.2.250.12/32	10.2.250.12 – 10.2.250.12	10.2.250.12
14	10.2.250.13/32	10.2.250.13 – 10.2.250.13	10.2.250.13
15	10.2.250.14/32	10.2.250.14 – 10.2.250.14	10.2.250.14
16	10.2.250.15/32	10.2.250.15 – 10.2.250.15	10.2.250.15
17	10.2.250.16/32	10.2.250.16 – 10.2.250.16	10.2.250.16
18	10.2.250.17/32	10.2.250.17 – 10.2.250.17	10.2.250.17
19	10.2.250.18/32	10.2.250.18 – 10.2.250.18	10.2.250.18
20	10.2.250.19/32	10.2.250.19 – 10.2.250.19	10.2.250.19
21	10.2.250.20/32	10.2.250.20 – 10.2.250.20	10.2.250.20
22	10.2.250.21/32	10.2.250.21 – 10.2.250.21	10.2.250.21
23	10.2.250.22/32	10.2.250.22 – 10.2.250.22	10.2.250.22
24	10.2.250.23/32	10.2.250.23 – 10.2.250.23	10.2.250.23
25	10.2.250.24/32	10.2.250.24 – 10.2.250.24	10.2.250.24
26	10.2.250.25/32	10.2.250.25 – 10.2.250.25	10.2.250.25
27	10.2.250.26/32	10.2.250.26 – 10.2.250.26	10.2.250.26
28	10.2.250.27/32	10.2.250.27 – 10.2.250.27	10.2.250.27
29	10.2.250.28/32	10.2.250.28 – 10.2.250.28	10.2.250.28
30	10.2.250.29/32	10.2.250.29 – 10.2.250.29	10.2.250.29
31	10.2.250.30/32	10.2.250.30 – 10.2.250.30	10.2.250.30
32	10.2.250.31/32	10.2.250.31 – 10.2.250.31	10.2.250.31
33	10.2.250.32/32	10.2.250.32 – 10.2.250.32	10.2.250.32
34	10.2.250.33/32	10.2.250.33 – 10.2.250.33	10.2.250.33
35	10.2.250.34/32	10.2.250.34 – 10.2.250.34	10.2.250.34
36	10.2.250.35/32	10.2.250.35 – 10.2.250.35	10.2.250.35
37	10.2.250.36/32	10.2.250.36 – 10.2.250.36	10.2.250.36
38	10.2.250.37/32	10.2.250.37 – 10.2.250.37	10.2.250.37
39	10.2.250.38/32	10.2.250.38 – 10.2.250.38	10.2.250.38
40	10.2.250.39/32	10.2.250.39 – 10.2.250.39	10.2.250.39
41	10.2.250.40/32	10.2.250.40 – 10.2.250.40	10.2.250.40
42	10.2.250.41/32	10.2.250.41 – 10.2.250.41	10.2.250.41
43	10.2.250.42/32	10.2.250.42 – 10.2.250.42	10.2.250.42
44	10.2.250.43/32	10.2.250.43 – 10.2.250.43	10.2.250.43
45	10.2.250.44/32	10.2.250.44 – 10.2.250.44	10.2.250.44
46	10.2.250.45/32	10.2.250.45 – 10.2.250.45	10.2.250.45
47	10.2.250.46/32	10.2.250.46 – 10.2.250.46	10.2.250.46
48	10.2.250.47/32	10.2.250.47 – 10.2.250.47	10.2.250.47
49	10.2.250.48/32	10.2.250.48 – 10.2.250.48	10.2.250.48
50	10.2.250.49/32	10.2.250.49 – 10.2.250.49	10.2.250.49
51	10.2.250.50/32	10.2.250.50 – 10.2.250.50	10.2.250.50
52	10.2.250.51/32	10.2.250.51 – 10.2.250.51	10.2.250.51
53	10.2.250.52/32	10.2.250.52 – 10.2.250.52	10.2.250.52
54	10.2.250.53/32	10.2.250.53 – 10.2.250.53	10.2.250.53
55	10.2.250.54/32	10.2.250.54 – 10.2.250.54	10.2.250.54
56	10.2.250.55/32	10.2.250.55 – 10.2.250.55	10.2.250.55
57	10.2.250.56/32	10.2.250.56 – 10.2.250.56	10.2.250.56
58	10.2.250.57/32	10.2.250.57 – 10.2.250.57	10.2.250.57
59	10.2.250.58/32	10.2.250.58 – 10.2.250.58	10.2.250.58
60	10.2.250.59/32	10.2.250.59 – 10.2.250.59	10.2.250.59
61	10.2.250.60/32	10.2.250.60 – 10.2.250.60	10.2.250.60
62	10.2.250.61/32	10.2.250.61 – 10.2.250.61	10.2.250.61
63	10.2.250.62/32	10.2.250.62 – 10.2.250.62	10.2.250.62
64	10.2.250.63/32	10.2.250.63 – 10.2.250.63	10.2.250.63
65	10.2.250.64/32	10.2.250.64 – 10.2.250.64	10.2.250.64
66	10.2.250.65/32	10.2.250.65 – 10.2.250.65	10.2.250.65
67	10.2.250.66/32	10.2.250.66 – 10.2.250.66	10.2.250.66
68	10.2.250.67/32	10.2.250.67 – 10.2.250.67	10.2.250.67
69	10.2.250.68/32	10.2.250.68 – 10.2.250.68	10.2.250.68
70	10.2.250.69/32	10.2.250.69 – 10.2.250.69	10.2.250.69
71	10.2.250.70/32	10.2.250.70 – 10.2.250.70	10.2.250.70
72	10.2.250.71/32	10.2.250.71 – 10.2.250.71	10.2.250.71
73	10.2.250.72/32	10.2.250.72 – 10.2.250.72	10.2.250.72
74	10.2.250.73/32	10.2.250.73 – 10.2.250.73	10.2.250.73
75	10.2.250.74/32	10.2.250.74 – 10.2.250.74	10.2.250.74
76	10.2.250.75/32	10.2.250.75 – 10.2.250.75	10.2.250.75
77	10.2.250.76/32	10.2.250.76 – 10.2.250.76	10.2.250.76
78	10.2.250.77/32	10.2.250.77 – 10.2.250.77	10.2.250.77
79	10.2.250.78/32	10.2.250.78 – 10.2.250.78	10.2.250.78
80	10.2.250.79/32	10.2.250.79 – 10.2.250.79	10.2.250.79
81	10.2.250.80/32	10.2.250.80 – 10.2.250.80	10.2.250.80
82	10.2.250.81/32	10.2.250.81 – 10.2.250.81	10.2.250.81
83	10.2.250.82/32	10.2.250.82 – 10.2.250.82	10.2.250.82
84	10.2.250.83/32	10.2.250.83 – 10.2.250.83	10.2.250.83
85	10.2.250.84/32	10.2.250.84 – 10.2.250.84	10.2.250.84
86	10.2.250.85/32	10.2.250.85 – 10.2.250.85	10.2.250.85
87	10.2.250.86/32	10.2.250.86 – 10.2.250.86	10.2.250.86
88	10.2.250.87/32	10.2.250.87 – 10.2.250.87	10.2.250.87
89	10.2.250.88/32	10.2.250.88 – 10.2.250.88	10.2.250.88
90	10.2.250.89/32	10.2.250.89 – 10.2.250.89	10.2.250.89
91	10.2.250.90/32	10.2.250.90 – 10.2.250.90	10.2.250.90
92	10.2.250.91/32	10.2.250.91 – 10.2.250.91	10.2.250.91
93	10.2.250.92/32	10.2.250.92 – 10.2.250.92	10.2.250.92
94	10.2.250.93/32	10.2.250.93 – 10.2.250.93	10.2.250.93
95	10.2.250.94/32	10.2.250.94 – 10.2.250.94	10.2.250.94
96	10.2.250.95/32	10.2.250.95 – 10.2.250.95	10.2.250.95
97	10.2.250.96/32	10.2.250.96 – 10.2.250.96	10.2.250.96
98	10.2.250.97/32	10.2.250.97 – 10.2.250.97	10.2.250.97
99	10.2.250.98/32	10.2.250.98 – 10.2.250.98	10.2.250.98
100	10.2.250.99/32	10.2.250.99 – 10.2.250.99	10.2.250.99
101	10.2.250.100/32	10.2.250.100 – 10.2.250.100	10.2.250.100
102	10.2.250.101/32	10.2.250.101 – 10.2.250.101	10.2.250.101
103	10.2.250.102/32	10.2.250.102 – 10.2.250.102	10.2.250.102
104	10.2.250.103/32	10.2.250.103 – 10.2.250.103	10.2.250.103
105	10.2.250.104/32	10.2.250.104 – 10.2.250.104	10.2.250.104
106	10.2.250.105/32	10.2.250.105 – 10.2.250.105	10.2.250.105
107	10.2.250.106/32	10.2.250.106 – 10.2.250.106	10.2.250.106
108	10.2.250.107/32	10.2.250.107 – 10.2.250.107	10.2.250.107
109	10.2.250.108/32	10.2.250.108 – 10.2.250.108	10.2.250.108
110	10.2.250.109/32	10.2.250.109 – 10.2.250.109	10.2.250.109
111	10.2.250.110/32	10.2.250.110 – 10.2.250.110	10.2.250.110
112	10.2.250.111/32	10.2.250.111 – 10.2.250.111	10.2.250.111
113	10.2.250.112/32	10.2.250.112 – 10.2.250.112	10.2.250.112
114	10.2.250.113/32	10.2.250.113 – 10.2.250.113	10.2.250.113
115	10.2.250.114/32	10.2.250.114 – 10.2.250.114	10.2.250.114
116	10.2.250.115/32	10.2.250.115 – 10.2.250.115	10.2.250.115
117	10.2.250.116/32	10.2.250.116 – 10.2.250.116	10.2.250.116
118	10.2.250.117/32	10.2.250.117 – 10.2.250.117	10.2.250.117
119	10.2.250.118/32	10.2.250.118 – 10.2.250.118	10.2.250.118
120	10.2.250.119/32	10.2.250.119 – 10.2.250.119	10.2.250.119
121	10.2.250.120/32	10.2.250.120 – 10.2.250.120	10.2.250.120
122	10.2.250.121/32	10.2.250.121 – 10.2.250.121	10.2.250.121
123	10.2.250.122/32	10.2.250.122 – 10.2.250.122	10.2.250.122
124	10.2.250.123/32	10.2.250.123 – 10.2.250.123	10.2.250.123
125	10.2.250.124/32	10.2.250.124 – 10.2.250.124	10.2.250.124
126	10.2.250.125/32	10.2.250.125 – 10.2.250.125	10.2.250.125
127	10.2.250.126/32	10.2.250.126 – 10.2.250.126	10.2.250.126
128	10.2.250.127/32	10.2.250.127 – 10.2.250.127	10.2.250.127

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 →