Skip to main content

Advisory — “L Root” changing IP address on 1st November

This is advance notice that there is a scheduled change to the IP address for one of the authorities listed for the DNS root zone. The change is to L.ROOT-SERVERS.NET, which is administered by ICANN.

The new IPv4 address for this authority is 199.7.83.42.

This change is anticipated to be implemented in the root zone on 1 November 2007, however the new address is operational now. It will replace the previous IP address of 198.32.64.12.

We encourage operators of DNS infrastructure to update any references to the old IP address, and replace it with the new address. In particular, many DNS resolvers have a DNS root “hints” file. This should be updated with the new IP address.

New hints files will be available at the following URLs once the change has been formally executed:

  • ftp://rs.internic.net/domain/db.cache
  • ftp://rs.internic.net/domain/named.cache
  • ftp://rs.internic.net/domain/named.root
  • ftp://ftp.internic.net/domain/db.cache
  • ftp://ftp.internic.net/domain/named.cache
  • ftp://ftp.internic.net/domain/named.root

It is expected that the old address will continue to work for at least six months after the transition, but will ultimately be retired from service.

Comments

    Domain Name System
    Internationalized Domain Name ,IDN,"IDNs are domain names that include characters used in the local representation of languages that are not written with the twenty-six letters of the basic Latin alphabet ""a-z"". An IDN can contain Latin letters with diacritical marks, as required by many European languages, or may consist of characters from non-Latin scripts such as Arabic or Chinese. Many languages also use other types of digits than the European ""0-9"". The basic Latin alphabet together with the European-Arabic digits are, for the purpose of domain names, termed ""ASCII characters"" (ASCII = American Standard Code for Information Interchange). These are also included in the broader range of ""Unicode characters"" that provides the basis for IDNs. The ""hostname rule"" requires that all domain names of the type under consideration here are stored in the DNS using only the ASCII characters listed above, with the one further addition of the hyphen ""-"". The Unicode form of an IDN therefore requires special encoding before it is entered into the DNS. The following terminology is used when distinguishing between these forms: A domain name consists of a series of ""labels"" (separated by ""dots""). The ASCII form of an IDN label is termed an ""A-label"". All operations defined in the DNS protocol use A-labels exclusively. The Unicode form, which a user expects to be displayed, is termed a ""U-label"". The difference may be illustrated with the Hindi word for ""test"" — परीका — appearing here as a U-label would (in the Devanagari script). A special form of ""ASCII compatible encoding"" (abbreviated ACE) is applied to this to produce the corresponding A-label: xn--11b5bs1di. A domain name that only includes ASCII letters, digits, and hyphens is termed an ""LDH label"". Although the definitions of A-labels and LDH-labels overlap, a name consisting exclusively of LDH labels, such as""icann.org"" is not an IDN."