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)10.2.252.0/25

network10.2.252.0/25

broadcast10.2.252.127

first host10.2.252.1

last host10.2.252.126

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.2.252.0/25

address00001010.00000010.11111100.00000000

subnet mask11111111.11111111.11111111.10000000

network00001010.00000010.11111100.00000000

broadcast00001010.00000010.11111100.01111111

green = network part, grey = host part

hex0x0a02fc00

decimal167967744

reverse dns0.252.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:fc00

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.2.252.0/32	10.2.252.0 – 10.2.252.0	10.2.252.0
2	10.2.252.1/32	10.2.252.1 – 10.2.252.1	10.2.252.1
3	10.2.252.2/32	10.2.252.2 – 10.2.252.2	10.2.252.2
4	10.2.252.3/32	10.2.252.3 – 10.2.252.3	10.2.252.3
5	10.2.252.4/32	10.2.252.4 – 10.2.252.4	10.2.252.4
6	10.2.252.5/32	10.2.252.5 – 10.2.252.5	10.2.252.5
7	10.2.252.6/32	10.2.252.6 – 10.2.252.6	10.2.252.6
8	10.2.252.7/32	10.2.252.7 – 10.2.252.7	10.2.252.7
9	10.2.252.8/32	10.2.252.8 – 10.2.252.8	10.2.252.8
10	10.2.252.9/32	10.2.252.9 – 10.2.252.9	10.2.252.9
11	10.2.252.10/32	10.2.252.10 – 10.2.252.10	10.2.252.10
12	10.2.252.11/32	10.2.252.11 – 10.2.252.11	10.2.252.11
13	10.2.252.12/32	10.2.252.12 – 10.2.252.12	10.2.252.12
14	10.2.252.13/32	10.2.252.13 – 10.2.252.13	10.2.252.13
15	10.2.252.14/32	10.2.252.14 – 10.2.252.14	10.2.252.14
16	10.2.252.15/32	10.2.252.15 – 10.2.252.15	10.2.252.15
17	10.2.252.16/32	10.2.252.16 – 10.2.252.16	10.2.252.16
18	10.2.252.17/32	10.2.252.17 – 10.2.252.17	10.2.252.17
19	10.2.252.18/32	10.2.252.18 – 10.2.252.18	10.2.252.18
20	10.2.252.19/32	10.2.252.19 – 10.2.252.19	10.2.252.19
21	10.2.252.20/32	10.2.252.20 – 10.2.252.20	10.2.252.20
22	10.2.252.21/32	10.2.252.21 – 10.2.252.21	10.2.252.21
23	10.2.252.22/32	10.2.252.22 – 10.2.252.22	10.2.252.22
24	10.2.252.23/32	10.2.252.23 – 10.2.252.23	10.2.252.23
25	10.2.252.24/32	10.2.252.24 – 10.2.252.24	10.2.252.24
26	10.2.252.25/32	10.2.252.25 – 10.2.252.25	10.2.252.25
27	10.2.252.26/32	10.2.252.26 – 10.2.252.26	10.2.252.26
28	10.2.252.27/32	10.2.252.27 – 10.2.252.27	10.2.252.27
29	10.2.252.28/32	10.2.252.28 – 10.2.252.28	10.2.252.28
30	10.2.252.29/32	10.2.252.29 – 10.2.252.29	10.2.252.29
31	10.2.252.30/32	10.2.252.30 – 10.2.252.30	10.2.252.30
32	10.2.252.31/32	10.2.252.31 – 10.2.252.31	10.2.252.31
33	10.2.252.32/32	10.2.252.32 – 10.2.252.32	10.2.252.32
34	10.2.252.33/32	10.2.252.33 – 10.2.252.33	10.2.252.33
35	10.2.252.34/32	10.2.252.34 – 10.2.252.34	10.2.252.34
36	10.2.252.35/32	10.2.252.35 – 10.2.252.35	10.2.252.35
37	10.2.252.36/32	10.2.252.36 – 10.2.252.36	10.2.252.36
38	10.2.252.37/32	10.2.252.37 – 10.2.252.37	10.2.252.37
39	10.2.252.38/32	10.2.252.38 – 10.2.252.38	10.2.252.38
40	10.2.252.39/32	10.2.252.39 – 10.2.252.39	10.2.252.39
41	10.2.252.40/32	10.2.252.40 – 10.2.252.40	10.2.252.40
42	10.2.252.41/32	10.2.252.41 – 10.2.252.41	10.2.252.41
43	10.2.252.42/32	10.2.252.42 – 10.2.252.42	10.2.252.42
44	10.2.252.43/32	10.2.252.43 – 10.2.252.43	10.2.252.43
45	10.2.252.44/32	10.2.252.44 – 10.2.252.44	10.2.252.44
46	10.2.252.45/32	10.2.252.45 – 10.2.252.45	10.2.252.45
47	10.2.252.46/32	10.2.252.46 – 10.2.252.46	10.2.252.46
48	10.2.252.47/32	10.2.252.47 – 10.2.252.47	10.2.252.47
49	10.2.252.48/32	10.2.252.48 – 10.2.252.48	10.2.252.48
50	10.2.252.49/32	10.2.252.49 – 10.2.252.49	10.2.252.49
51	10.2.252.50/32	10.2.252.50 – 10.2.252.50	10.2.252.50
52	10.2.252.51/32	10.2.252.51 – 10.2.252.51	10.2.252.51
53	10.2.252.52/32	10.2.252.52 – 10.2.252.52	10.2.252.52
54	10.2.252.53/32	10.2.252.53 – 10.2.252.53	10.2.252.53
55	10.2.252.54/32	10.2.252.54 – 10.2.252.54	10.2.252.54
56	10.2.252.55/32	10.2.252.55 – 10.2.252.55	10.2.252.55
57	10.2.252.56/32	10.2.252.56 – 10.2.252.56	10.2.252.56
58	10.2.252.57/32	10.2.252.57 – 10.2.252.57	10.2.252.57
59	10.2.252.58/32	10.2.252.58 – 10.2.252.58	10.2.252.58
60	10.2.252.59/32	10.2.252.59 – 10.2.252.59	10.2.252.59
61	10.2.252.60/32	10.2.252.60 – 10.2.252.60	10.2.252.60
62	10.2.252.61/32	10.2.252.61 – 10.2.252.61	10.2.252.61
63	10.2.252.62/32	10.2.252.62 – 10.2.252.62	10.2.252.62
64	10.2.252.63/32	10.2.252.63 – 10.2.252.63	10.2.252.63
65	10.2.252.64/32	10.2.252.64 – 10.2.252.64	10.2.252.64
66	10.2.252.65/32	10.2.252.65 – 10.2.252.65	10.2.252.65
67	10.2.252.66/32	10.2.252.66 – 10.2.252.66	10.2.252.66
68	10.2.252.67/32	10.2.252.67 – 10.2.252.67	10.2.252.67
69	10.2.252.68/32	10.2.252.68 – 10.2.252.68	10.2.252.68
70	10.2.252.69/32	10.2.252.69 – 10.2.252.69	10.2.252.69
71	10.2.252.70/32	10.2.252.70 – 10.2.252.70	10.2.252.70
72	10.2.252.71/32	10.2.252.71 – 10.2.252.71	10.2.252.71
73	10.2.252.72/32	10.2.252.72 – 10.2.252.72	10.2.252.72
74	10.2.252.73/32	10.2.252.73 – 10.2.252.73	10.2.252.73
75	10.2.252.74/32	10.2.252.74 – 10.2.252.74	10.2.252.74
76	10.2.252.75/32	10.2.252.75 – 10.2.252.75	10.2.252.75
77	10.2.252.76/32	10.2.252.76 – 10.2.252.76	10.2.252.76
78	10.2.252.77/32	10.2.252.77 – 10.2.252.77	10.2.252.77
79	10.2.252.78/32	10.2.252.78 – 10.2.252.78	10.2.252.78
80	10.2.252.79/32	10.2.252.79 – 10.2.252.79	10.2.252.79
81	10.2.252.80/32	10.2.252.80 – 10.2.252.80	10.2.252.80
82	10.2.252.81/32	10.2.252.81 – 10.2.252.81	10.2.252.81
83	10.2.252.82/32	10.2.252.82 – 10.2.252.82	10.2.252.82
84	10.2.252.83/32	10.2.252.83 – 10.2.252.83	10.2.252.83
85	10.2.252.84/32	10.2.252.84 – 10.2.252.84	10.2.252.84
86	10.2.252.85/32	10.2.252.85 – 10.2.252.85	10.2.252.85
87	10.2.252.86/32	10.2.252.86 – 10.2.252.86	10.2.252.86
88	10.2.252.87/32	10.2.252.87 – 10.2.252.87	10.2.252.87
89	10.2.252.88/32	10.2.252.88 – 10.2.252.88	10.2.252.88
90	10.2.252.89/32	10.2.252.89 – 10.2.252.89	10.2.252.89
91	10.2.252.90/32	10.2.252.90 – 10.2.252.90	10.2.252.90
92	10.2.252.91/32	10.2.252.91 – 10.2.252.91	10.2.252.91
93	10.2.252.92/32	10.2.252.92 – 10.2.252.92	10.2.252.92
94	10.2.252.93/32	10.2.252.93 – 10.2.252.93	10.2.252.93
95	10.2.252.94/32	10.2.252.94 – 10.2.252.94	10.2.252.94
96	10.2.252.95/32	10.2.252.95 – 10.2.252.95	10.2.252.95
97	10.2.252.96/32	10.2.252.96 – 10.2.252.96	10.2.252.96
98	10.2.252.97/32	10.2.252.97 – 10.2.252.97	10.2.252.97
99	10.2.252.98/32	10.2.252.98 – 10.2.252.98	10.2.252.98
100	10.2.252.99/32	10.2.252.99 – 10.2.252.99	10.2.252.99
101	10.2.252.100/32	10.2.252.100 – 10.2.252.100	10.2.252.100
102	10.2.252.101/32	10.2.252.101 – 10.2.252.101	10.2.252.101
103	10.2.252.102/32	10.2.252.102 – 10.2.252.102	10.2.252.102
104	10.2.252.103/32	10.2.252.103 – 10.2.252.103	10.2.252.103
105	10.2.252.104/32	10.2.252.104 – 10.2.252.104	10.2.252.104
106	10.2.252.105/32	10.2.252.105 – 10.2.252.105	10.2.252.105
107	10.2.252.106/32	10.2.252.106 – 10.2.252.106	10.2.252.106
108	10.2.252.107/32	10.2.252.107 – 10.2.252.107	10.2.252.107
109	10.2.252.108/32	10.2.252.108 – 10.2.252.108	10.2.252.108
110	10.2.252.109/32	10.2.252.109 – 10.2.252.109	10.2.252.109
111	10.2.252.110/32	10.2.252.110 – 10.2.252.110	10.2.252.110
112	10.2.252.111/32	10.2.252.111 – 10.2.252.111	10.2.252.111
113	10.2.252.112/32	10.2.252.112 – 10.2.252.112	10.2.252.112
114	10.2.252.113/32	10.2.252.113 – 10.2.252.113	10.2.252.113
115	10.2.252.114/32	10.2.252.114 – 10.2.252.114	10.2.252.114
116	10.2.252.115/32	10.2.252.115 – 10.2.252.115	10.2.252.115
117	10.2.252.116/32	10.2.252.116 – 10.2.252.116	10.2.252.116
118	10.2.252.117/32	10.2.252.117 – 10.2.252.117	10.2.252.117
119	10.2.252.118/32	10.2.252.118 – 10.2.252.118	10.2.252.118
120	10.2.252.119/32	10.2.252.119 – 10.2.252.119	10.2.252.119
121	10.2.252.120/32	10.2.252.120 – 10.2.252.120	10.2.252.120
122	10.2.252.121/32	10.2.252.121 – 10.2.252.121	10.2.252.121
123	10.2.252.122/32	10.2.252.122 – 10.2.252.122	10.2.252.122
124	10.2.252.123/32	10.2.252.123 – 10.2.252.123	10.2.252.123
125	10.2.252.124/32	10.2.252.124 – 10.2.252.124	10.2.252.124
126	10.2.252.125/32	10.2.252.125 – 10.2.252.125	10.2.252.125
127	10.2.252.126/32	10.2.252.126 – 10.2.252.126	10.2.252.126
128	10.2.252.127/32	10.2.252.127 – 10.2.252.127	10.2.252.127

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 →