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    • .mo

    Country-code top-level domains

    Overview

    • .mo is the country-code top-level domain (ccTLD) assigned to Macau (Macao).
    • The label "mo" derives from "Macao"/"Macau" and the ccTLD was introduced on 17 September 1992.
    • Intended for entities connected with Portuguese Macau (1992–1999) and Macau SAR, China (1999–present).
    • Actual use is limited to organizations and entities based in Macau.

    History

    • Introduced: 17 September 1992.
    • Registry: administered under the Macao Network Information Centre (MONIC).
    • Operation history noted in the sources:
      • MONIC was operated by the University of Macau from 1992.
      • Effective 12 March 2011, HNET Asia Limited was appointed by the Government of Macau to operate MONIC.
      • Another source lists the Macao Post and Telecommunications Bureau (CTT) as a managing entity for .mo.
    • Internationalized TLDs: in early 2015 two Chinese-script top-level domains were reserved for Macau—.澳门 (simplified) and .澳門 (traditional); MONIC requested these domains.

    Usage and Audience

    • Primary users are entities physically or legally based in Macau:
      • Local businesses and commercial entrepreneurs
      • Government agencies (e.g., .gov.mo)
      • Educational institutions (e.g., .edu.mo)
      • Network service providers (e.g., .net.mo)
      • Non-profit organizations (e.g., .org.mo)
    • The namespace is used mainly for Macau-focused sites and services; registrations are limited to applicants with a Macau connection.

    Registration Rules

    • General eligibility:
      • Applicants must be legal entities, commercial entrepreneurs, or self-employed persons registered in Macau.
      • Registrations are restricted to local businesses and organisations in Macau.
      • Second-level registrations (.mo) are available; second-level registrations have become available to registrants who already hold the same name at the third level.
    • Second-level / second-tier structure and eligibility examples:
      • .com.mo / .公司.mo: commercial entrepreneurs or self-employed persons registered in Macau.
      • .net.mo / .網絡.mo: licensed network or telecommunication service providers or entities authorized by Macao SAR Internet resources.
      • .org.mo / .組織.mo: organisations registered within Macau.
      • .edu.mo / .教育.mo: Macau educational institutions accredited in Macau.
      • .gov.mo / .政府.mo: public/government entities in Macau.
    • Internationalized and Chinese-label rules:
      • Chinese-script second-level labels (e.g., .公司.mo, .網絡.mo, .組織.mo, .教育.mo, .政府.mo) may contain English and Chinese characters, but at least one Chinese character is required.
      • After approval of a Chinese-character domain under certain suffixes, the registrant may also use the corresponding simplified/traditional Chinese variant without additional fee.
    • Allowed characters and length:
      • For Latin-script second-level registrations (.com.mo, .net.mo, .org.mo, .edu.mo, .gov.mo): letters A–Z (case-insensitive), digits 0–9, hyphens (-), and Portuguese special characters (á, à, â, ã, ç, é, ê, í, ó, ô, õ, ú) are permitted.
      • Domain name length: not more than 63 characters. (The rule emphasizes the 63-character limit after Punycode transcoding; Chinese characters and Portuguese special characters are counted in the Punycode length limitation.)
      • Hyphen usage: hyphens must not appear at the beginning or end of a name; the third and fourth characters cannot both be hyphens.
    • Reserved names: there is a list of reserved domain names maintained by the registry.

    Operator

    Macao Post and Telecommunications Bureau (CTT)

    Whois

    % IANA WHOIS server
% for more information on IANA, visit http://www.iana.org
% This query returned 1 object

domain:       MO

organisation: Macao Post and Telecommunications Bureau (CTT)
address:      Largo do Senado, Edf. Sede dos CTT
address:      Macau
address:      Macao

contact:      administrative
name:         MONIC Administrative Contact
organisation: Macao Network Information Centre (MONIC) - HNET Asia
address:      Macao Post and Telecommunications Bureau
address:      Avenida da Praia Grande no.789, R/C
address:      Macau
address:      Macao
phone:        +853 28716636
fax-no:       +853 28716606
e-mail:       hnet.asia-admin@monic.mo

contact:      technical
name:         MONIC Technical Contact
organisation: Macao Network Information Centre (MONIC) - HNET Asia
address:      Macao Post and Telecommunications Bureau
address:      Avenida da Praia Grande no.789, R/C
address:      Macau
address:      Macao
phone:        +853 28716636
fax-no:       +853 28716606
e-mail:       hnet.asia-tech@monic.mo

nserver:      A.MONIC.MO 2001:f90:2:8:0:0:0:2 202.175.87.47
nserver:      B.MONIC.MO 2001:f90:2:8:0:0:0:3 202.175.87.48
nserver:      C.MONIC.MO 2001:f90:2:8:0:0:0:4 202.175.87.49
nserver:      D.MONIC.MO 2001:f90:8:0:0:0:0:2 202.175.51.115
nserver:      E.MONIC.MO 2001:f90:8:0:0:0:0:3 202.175.51.116
nserver:      NS17.CDNS.NET 194.0.1.17 2001:678:4:0:0:0:0:11
nserver:      NS2.CUHK.EDU.HK 137.189.6.21 2405:3000:3:6:0:0:0:15

whois:        whois.monic.mo

status:       ACTIVE
remarks:      Registration information: https://www.monic.mo

created:      1992-09-17
changed:      2022-06-08
source:       IANA

    Registrars