Berkeley CSUA MOTD:Entry 18781
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2025/07/12 [General] UID:1000 Activity:popular
7/12    

2000/7/26-27 [Computer/Domains] UID:18781 Activity:high
7/24    I'm setting up my (lame mac) mailserver to block relaying from all IPs
        except X,Y & Z. I have someone who dials in to concentric that i want
        to allow and am willing to let all concentric users in order to do so.
        However, mean ol' concentric won't tell me what IPs they give out to
        dial up users.  How can i find out which I.P. blocks concentric owns?
        \_ whois -h http://whois.arin.net <IP address>
            \_ that's great, now i just need to do that for every possible
                ip address and keep track of which ones concentric owns.  TX!
               \_ Pick a concentric address, any address. Then do a whois
                  on it. Pay special attention to the "Netblock" field.
                  Sheesh.
                   \_ o.k. that tells me which block that ip address is in
                      which is helpful, but they likely own other blocks
                        as well.  Is there a way to find that out?
                      \_ whois -h http://whois.arin.net concentric
                         You might have better luck running whois on a known
                         dialup IP address.
                          \_ no, that worked perfect, thanks!
2025/07/12 [General] UID:1000 Activity:popular
7/12    

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Cache (2792 bytes)
whois.arin.net -> ww1.arin.net/whois/
ARIN WHOIS Help Search for : Submit ARIN's WHOIS service provides a mechanism for finding contact and registration information for resources registered with ARIN. ARIN's database contains IP addresses, autonomous system (AS) numbers, organizations or customers that are associated with these resources, and related Points of Contact (POCs). ARIN's WHOIS will NOT locate any domain-related information, or any information relating to military networks. Many of these flags can be combined to indicate the desired output. Flags must be separated from each other and from the search term by a space. Your results will vary depending on the refinements you apply in your search. Query-by-record-type: To limit your query to a specific record type, include one of the following flags: n Network address space a Autonomous systems p Points of Contact o Organizations c End-user customers Query-by-attribute: To limit your query to a specific record attribute, include one of the following flags: @ <domain name> Searches for matches by the domain-portion of an e-mail address ! Searches that retrieve more than one record will be displayed in list output. Display flags: To modify the way that the query results display, include one of the following flags: + Shows detailed (aka 'full' output) display for EACH match - Shows summary only (aka 'list' output), even if single match returned The + flag cannot be used with the sub-query feature described below. Record hierarchy: Records in the ARIN WHOIS database have hierarchical relationship with other records. To display those related records, use the following flags: < Displays the record related up the hierarchy. For a network, display the supernet, or parent network in detailed (full) format. For a network, display the subdelegation, or subnets, below the network, in summary (list) format. For an organization or customer, display the resource registered to that organization or customer, in summary (list) format. This feature is only supported as a trailing character option. To take advantage of this append the query with an asterisk . This can also be used in combination with any flags defined above. Other helpful hints: To guarantee matching only a single record, look it up by its handle using a handle-only search. In the record summary line, the handle is shown in parentheses after the name. When using a handle to conduct a search for POC information, be sure to add the -ARIN extension. Queries that return more than 256 results will stop displaying data after the 256th result. You may want to narrow your search criteria or add flags to your query to limit the results. To search on an individual's name, you may enter the last name, or to further restrict results, use the last name and first name, separated by a comma.