Type

Code

Meaning

Type

Code

Meaning

0

0

Echo Reply

5

0

Redirect datagram for the network

3

0

Net Unreachable

1

Redirect datagram for the host

1

Host Unreachable

2

Redirect datagram for the TOS & Network

2

Protocol Unreachable

3

Redirect datagram for the TOS & Host

3

Port Unreachable

8

0

Echo

4

Frag needed and DF set

9

0

Router advertisement

5

Source route failed

10

0

Router selection

6

Dest network unknown

11

0

Time To Live exceeded in transit

7

Dest host unknown

1

Fragment reassemble time exceeded

8

Source host isolated

12

0

Pointer indicates the error (Parameter Problem)

9

Network admin prohibited

1

Missing a required option (Parameter Problem)

10

Host admin prohibited

2

Bad length (Parameter Problem)

11

Network unreachable for TOS

13

0

Time Stamp

12

Host unreachable for TOS

14

0

Time Stamp Reply

13

Communication admin prohibited

15

0

Information Request

4

0

Source Quench (Slow down/Shut up)

16

0

Information Reply

17

0

Address Mask Request

18

0

Address Mask Reply

30

0

Traceroute (Tracert)

Type

Code

Meaning

Type

Code

Meaning

0

0

Echo Reply

5

0

Redirect datagram for the network

3

0

Net Unreachable

1

Redirect datagram for the host

1

Host Unreachable

2

Redirect datagram for the TOS & Network

2

Protocol Unreachable

3

Redirect datagram for the TOS & Host

3

Port Unreachable

8

0

Echo

4

Frag needed and DF set

9

0

Router advertisement

5

Source route failed

10

0

Router selection

6

Dest network unknown

11

0

Time To Live exceeded in transit

7

Dest host unknown

1

Fragment reassemble time exceeded

8

Source host isolated

12

0

Pointer indicates the error (Parameter Problem)

9

Network admin prohibited

1

Missing a required option (Parameter Problem)

10

Host admin prohibited

2

Bad length (Parameter Problem)

11

Network unreachable for TOS

13

0

Time Stamp

12

Host unreachable for TOS

14

0

Time Stamp Reply

13

Communication admin prohibited

15

0

Information Request

4

0

Source Quench (Slow down/Shut up)

16

0

Informaiton Reply

17

0

Address Mask Request

18

0

Address Mask Reply

30

0

Traceroute (Tracert)