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DNS Whois Tools:

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Home List Of ICMP Type Codes:
ICMP (Internet Control Message Protocol)

ICMP type Name Code Description
0 Echo Reply 0 No Code
1 Unassigned    
2 Unassigned    
3 Destination Unreachable 0 Net Unreachable
    1 Host Unreachable
    2 Protocol Unreachable
    3 Port Unreachable
    4 Fragmentation Needed and Don't Fragment was Set
    5 Source Route Failed
    6 Destination Network Unknown
    7 Destination Host Unknown
    8 Source Host Isolated
    9 Communication with Destination Host is Administratively Prohibited
    10 Communication with Destination Host is Administratively Prohibited
    11 Destination Network Unreachable for Type of Service
    12 Destination Host Unreachable for Type of Service
4 Source Quench 0 No Code
5 Redirect 0  
6 Alternate Host Address 0  
7 Unassigned    
8 Echo 0 No Code
9 Router Advertisement 0 No Code
10 Router Selection 0 No Code
11 Time exceeded 0 Time to Live exceeded in Transit
    1 Fragment Reassembly Time Exceeded
12 Parameter Problem 0 Pointer indicates the error
    1 Missing a Required Option
    2 Bad Length
13 Timestamp 0 No Code
14 Timestamp Reply 0 No Code
15 Information Request 0 No Code
16 Information Reply 0 No Code
17 Address Mask Request 0 No Code
18 Address Mask Reply 0 No Code
19 Reserved (for Security)    
20-29 Reserved (for Robustness Experiment)    
30 Traceroute    
31 Datagram Conversion Error    
32 Mobile Host Redirect    
33 IPv6 Where-Are-You    
34 IPv6 I-Am-Here    
35 Mobile Registration Request    
36 Mobile Registration Reply    
37 Domain Name Request    
38 Domain Name Reply    
39 SKIP    
40 Photuris    
41-255 Reserved    


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