The Arpa zone is something of an anachronism. It now stands for Address and Routing Parameter Area.
IPv4 reverse lookups can be found under IN-ADDR.ARPA.
IPv6 reverse lookups can be found under IP6.ARPA.
Note the End of Zone marker from Verisign; you can look up the TXT record for VRSN-END-OF-ZONE-MARKER-DUMMY-RECORD.ARPA
$ORIGIN ARPA. @ IN SOA A.ROOT-SERVERS.NET. NSTLD.VERISIGN-GRS.COM. ( 2008010400 ;serial 1800 ;refresh every 30 min 900 ;retry every 15 min 604800 ;expire after a week 86400 ;minimum of a day ) $TTL 518400 NS A.ROOT-SERVERS.NET. NS H.ROOT-SERVERS.NET. NS C.ROOT-SERVERS.NET. NS G.ROOT-SERVERS.NET. NS F.ROOT-SERVERS.NET. NS B.ROOT-SERVERS.NET. NS K.ROOT-SERVERS.NET. NS L.ROOT-SERVERS.NET. NS M.ROOT-SERVERS.NET. NS I.ROOT-SERVERS.NET. NS E.ROOT-SERVERS.NET. NS D.ROOT-SERVERS.NET. $TTL 172800 IN-ADDR NS A.ROOT-SERVERS.NET. IN-ADDR NS H.ROOT-SERVERS.NET. IN-ADDR NS C.ROOT-SERVERS.NET. IN-ADDR NS G.ROOT-SERVERS.NET. IN-ADDR NS F.ROOT-SERVERS.NET. IN-ADDR NS B.ROOT-SERVERS.NET. IN-ADDR NS K.ROOT-SERVERS.NET. IN-ADDR NS L.ROOT-SERVERS.NET. IN-ADDR NS M.ROOT-SERVERS.NET. IN-ADDR NS I.ROOT-SERVERS.NET. IN-ADDR NS E.ROOT-SERVERS.NET. IN-ADDR NS D.ROOT-SERVERS.NET. E164 NS NS0.VERIO.NET. E164 NS SUNIC.SUNET.SE. E164 NS SEC3.APNIC.NET. E164 NS E164-ARPA.CNNIC.NET.CN. E164 NS TINNIE.ARIN.NET. E164 NS NS-PRI.RIPE.NET. IP6 NS NS.ICANN.ORG. IP6 NS SEC1.APNIC.NET. IP6 NS NS.LACNIC.NET. IP6 NS TINNIE.ARIN.NET. IP6 NS NS-SEC.RIPE.NET. URI NS A.IANA-SERVERS.NET. URI NS B.IANA-SERVERS.NET. URI NS SEC3.APNIC.NET. URI NS C.IANA-SERVERS.NET. URI NS NS.LACNIC.NET. URN NS A.IANA-SERVERS.NET. URN NS B.IANA-SERVERS.NET. URN NS SEC3.APNIC.NET. URN NS C.IANA-SERVERS.NET. URN NS NS.LACNIC.NET. IRIS NS A.IANA-SERVERS.NET. IRIS NS B.IANA-SERVERS.NET. IRIS NS SEC3.APNIC.NET. IRIS NS C.IANA-SERVERS.NET. IRIS NS NS.LACNIC.NET. VRSN-END-OF-ZONE-MARKER-DUMMY-RECORD TXT plenus
2008-01-02 RB