IP Addressing CompTIA Network+ N10-009

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Last updated 7:01 PM on 9/15/26
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29 Terms

1
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RFC 1918 Class A

10.0.0.0 to 10.255.255.255

2
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RFC 1918 Class B

172.16.0.0 to 172.31.255.255

3
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RFC 1918 Class C

192.168.0.0 to 192.168.255.255

4
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Loopback Address

127.0.0.0 to 127.255.255.254 (Usually 127.0.0.1/localhost)

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APIPA

Automatic Private Internet Protocol Addressing - 169.254.0.1 - 169.254.255.254

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Public Class A

1.0.0.0 to 127.0.0.0

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Public Class B

128.0.0.0 to 191.255.0.0

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Public Class C

192.0.0.0 to 223.255.255.0

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Public Class D

224.0.0.0 to 239.0.0.0 (Multicast)

10
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Public Class E

240.0.0.0 to 255.0.0.0 (Experimental)

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/32

IP Addresses: 1

Subnet Mask 255.255.255.255

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/31

IP Addresses: 2

Subnet Mask 255.255.255.254

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/30

IP Addresses: 4

Subnet Mask 255.255.255.252

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/29

IP Addresses: 8

Subnet Mask 255.255.255.248

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/28

IP Addresses: 16

Subnet Mask 255.255.255.240

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/27

IP Addresses: 32

Subnet Mask 255.255.255.224

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/26

IP Addresses: 64

Subnet Mask 255.255.255.192

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/25

IP Addresses: 128

Subnet Mask 255.255.255.128

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/24

IP Addresses: 256

Subnet Mask 255.255.255.0

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/23

IP Addresses: 512

Subnet Mask 255.255.254.0

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/22

IP Addresses: 1024

Subnet Mask 255.255.252.0

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/21

IP Addresses: 2048

Subnet Mask 255.255.248.0

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/20

IP Addresses: 4096

Subnet Mask 255.255.240.0

24
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IPv6

- 0-9 and A-F

- Drop leading zeroes (0db8 = db8/0000:0000 = ::)

- 128 bits

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Link-Local Address

- Automatically configured IPv6 address configured upon initialization.

- Communicates with neighbors on local subnet.

- Starts with fe80::/10

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Global Unicast Address

- The public IPv6 equivalent of a public IPv4 address, routable on the internet.

- Typically starts with 2 or 3.

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Unique Local Address

- The public IPv6 equivalent of an RFC 1918 private IPv4 address.

- Typically starts with fd.

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Static IP

- Manually configured IP, Subnet Mask, Default Gateway, and DNS server.

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Dynamic IP

- Assigned automatically by a DHCP server.

- APIPA is the fallback if DHCP fails.