Monitoring the DNS Top-Level Domains' nameservers

Nameservers with at least one serious problem (163)

Nameservers without serious problems (864)

It is possible that they failed a test recently but it may be a transitory situation.

A-DNS.PL	A.CI-SERVERS.NET
A.DNS-SERVER.IQ	A.DNS.BR
A.DNS.CN	A.DNS.JP
A.DNS.LU	A.DNS.TW
A.FI	A.GOV.ZONEEDIT.COM
A.GTLD-SERVERS.NET	A.GTLD.BIZ
A.GTLD.PRO	A.NIC.AC
A.NIC.CL	A.NIC.DE
A.NIC.DK	A.NIC.EU
A.NIC.FR	A.NIC.IO
A.NIC.SH	A.NIC.TEL
A.NIC.TM	A.NS.DNS.BE
A.NS.MX	A.NS.NIC.CZ
A.NS.SE	A.NS13.NET
A.ROOT-SERVERS.NET	A.TLD.LT
A0.AERO.AFILIAS-NST.INFO	A0.ASIA.AFILIAS-NST.INFO
A0.INFO.AFILIAS-NST.INFO	A0.MOBI.AFILIAS-NST.INFO
A0.ORG.AFILIAS-NST.INFO	A1.IN.AFILIAS-NST.IN
A3.NSTLD.COM	A5.NSTLD.COM
A9.ASIA.AFILIAS-NST.ASIA	A9.INFO.AFILIAS-NST.INFO
A9.LC.AFILIAS-NST.INFO	A9.MN.AFILIAS-NST.INFO
AD.NS.NIC.ES	ADNS1.BERKELEY.EDU
ADNS2.BERKELEY.EDU	ALPHA.UNDP.ORG
AMRA.NIC.GOV.JO	AMSTERDAM.NS.DNS.BE
ANS1.CANAR.SD	ANS1.SIS.SD
ANYNS.PCH.NET	ANYNS.UEM.MZ
ARWENA.NASK.WAW.PL	ASKIA.SOTELMA.ML
ATHEA.AR	AUDNS.OPTUS.NET
AUNIC.AUNIC.NET	AUSTIN.GH.COM
AUTH01.CONNECT.IE	AUTH100.NS.UU.NET
AUTH101.NS.UU.NET	AUTH110.NS.UU.NET
AUTH51.NS.UU.NET	AVALA.YUBC.NET
AZMODAN.ULA.VE	B-DNS.PL
B.DNS-SERVER.IQ	B.DNS.BR
B.DNS.CN	B.DNS.JP
B.DNS.KR	B.DNS.LU
B.DNS.TW	B.EU.DNS.BE
B.EXT.NIC.FR	B.FI
B.GOV.ZONEEDIT.COM	B.GTLD-SERVERS.NET
B.GTLD.BIZ	B.GTLD.PRO
B.HOSTING.NIC.FR	B.IEDR.IE
B.NIC.AC	B.NIC.DK
B.NIC.IO	B.NIC.TEL
B.NS.DNS.BE	B.NS.MX
B.NS.NIC.CZ	B.NS.SE
B.NS13.NET	B.ROOT-SERVERS.NET
B.TLD.LT	B0.AERO.AFILIAS-NST.ORG
B0.ASIA.AFILIAS-NST.ASIA	B0.INFO.AFILIAS-NST.ORG
B0.MOBI.AFILIAS-NST.ORG	B0.ORG.AFILIAS-NST.ORG
B1.IN.AFILIAS-NST.IN	B9.ASIA.AFILIAS-NST.INFO
B9.INFO.AFILIAS-NST.ORG	B9.LC.AFILIAS-NST.ORG
B9.MN.AFILIAS-NST.ORG	BANBA.DOMAINREGISTRY.IE
BARNEY.ADVSYS.CO.UK	BCN1.ADAMSNAMES.COM
BOW.INTNET.CF	BOW.INTNET.GQ
BOW.INTNET.TD	BRUSSELS.NS.DNS.BE
C-DNS.PL	C.DE.NET
C.DNS-SERVER.IQ	C.DNS.BR
C.DNS.CN	C.DNS.JP
C.DNS.KR	C.DNS.LU
C.DNS.TW	C.FI
C.GOV.ZONEEDIT.COM	C.GTLD-SERVERS.NET
C.GTLD.BIZ	C.GTLD.PRO
C.NIC.DK	C.NIC.FR
C.NIC.TEL	C.NS.DNS.BE
C.NS.MX	C.NS.NIC.CZ
C.NS.SE	C.ROOT-SERVERS.NET
C.TLD.LT	C0.AERO.AFILIAS-NST.INFO
C0.ASIA.AFILIAS-NST.INFO	C0.CCTLD.AFILIAS-NST.INFO
C0.INFO.AFILIAS-NST.INFO	C0.MOBI.AFILIAS-NST.INFO
C0.ORG.AFILIAS-NST.INFO	C3.NSTLD.COM
C5.NSTLD.COM	CA01.CIRA.CA
CA02.CIRA.CA	CA03.CIRA.CA
CA04.CIRA.CA	CA05.CIRA.CA
CA06.CIRA.CA	CASTOR.TELEGLOBE.NET
CAT-DNS.DENIC.DE	CCTLD.TIX.CH
CENTRAL.DNS.MD	CH1.DNSNODE.NET
CHAMBO.SDNP.ORG.MW	CHARLES.CDEC.POLYMTL.CA
CHC1.ADAMSNAMES.COM	CI.HOSTING.NIC.FR
CIR.RED.SV	CIRCA.MCS.VUW.AC.NZ
CIWARA.SOTELMA.ML	CL1.DNSNODE.NET
COLO.TO	CON1.NIPR.MIL
CON2.NIPR.MIL	COOP1.DYNTLD.NET
COOP2.DYNTLD.NET	COOP3.DYNTLD.NET
COOP4.DYNTLD.NET	COPENHAGEN.NIC.FO
CTINA.AR	CX1.DYNTLD.NET
CX2.DYNTLD.NET	CX3.DYNTLD.NET
CX4.DYNTLD.NET	CYNIC.DNS.CY
D-DNS.PL	D.DNS-SERVER.IQ
D.DNS.BR	D.DNS.CN
D.DNS.JP	D.DNS.KR
D.DNS.LU	D.DNS.TW
D.EXT.NIC.FR	D.FI
D.GOV.ZONEEDIT.COM	D.GTLD-SERVERS.NET
D.GTLD.BIZ	D.NIC.AT
D.NIC.TEL	D.NS.MX
D.NS.NIC.CZ	D.NS.SE
D.ROOT-SERVERS.NET	D.TLD.LT
D0.AERO.AFILIAS-NST.ORG	D0.ASIA.AFILIAS-NST.ASIA
D0.CCTLD.AFILIAS-NST.ORG	D0.INFO.AFILIAS-NST.ORG
D0.MOBI.AFILIAS-NST.ORG	D0.ORG.AFILIAS-NST.ORG
D3.NSTLD.COM	D5.NSTLD.COM
DCA.TLD.GDNS.NET	DECST.CERIST.DZ
DESCARTES.NIC.PR	DINIS.AD
DNS-AT.ROTLD.RO	DNS-CAT.PCH.NET
DNS-RO.DENIC.DE	DNS.BELPAK.BY
DNS.CIT.CORNELL.EDU	DNS.DNSAFRICA.NET
DNS.FCCN.PT	DNS.INRIA.FR
DNS.INTELCOM.SM	DNS.MYNIC.NET.MY
DNS.NETTUNO.IT	DNS.NIC.BS
DNS.NIC.IT	DNS.NIC.TT
DNS.OMNIWAY.SM	DNS.PRINCETON.EDU
DNS.SERVER.AG	DNS.SRCE.HR
DNS.WR.USGS.GOV	DNS1.CENPAC.NET.NR
DNS1.GOV.PS	DNS1.KEMS.NET
DNS1.KM	DNS1.KW
DNS1.NET.SY	DNS1.NIC.EC
DNS1.ONLINE.COM.KH	DNS1.TELEKOM.NET.SB
DNS1.TELSTRA.NET	DNS2.AD
DNS2.GT.AMNETDATOS.NET	DNS2.GUERNSEY.NET
DNS2.IT.NET	DNS2.KW
DNS2.MYNIC.NET.MY	DNS2.NET.SY
DNS2.NIC.EC	DNS3.AD
DNS3.KW	DNS3.NIC.EC
DNS4.AD	DNS4.NIC.EC
DNS7.DENIC.DE	DNS8.DENIC.DE
DO-DNS.NIC.PR	DOGON.SOTELMA.ML
DOMREG.NIC.CH	DOMWE.SDN.MW
DOWNSTAGE.MCS.VUW.AC.NZ	DS.NIC.NET.SG
DZOWO.UEM.MZ	E-DNS.PL
E.DNS-SERVER.IQ	E.DNS.BR
E.DNS.CN	E.DNS.JP
E.DNS.KR	E.DNS.TW
E.EXT.NIC.FR	E.FI
E.GOV.ZONEEDIT.COM	E.GTLD-SERVERS.NET
E.GTLD.BIZ	E.NIC.FR
E.NIC.TEL	E.NS.NIC.CZ
E.NS.SE	E.ROOT-SERVERS.NET
E3.NSTLD.COM	EFATE.VANUATU.COM.VU
EKEKO.RCPIP.NET	EUR1.NIPR.MIL
EUR2.NIPR.MIL	EURO-NS1.CW.NET
EURO-NS2.CW.NET	EURO-NS3.CW.NET
F-DNS.PL	F.DNS-SERVER.IQ
F.DNS.JP	F.DNS.KR
F.DNS.TW	F.EXT.NIC.FR
F.GOV.ZONEEDIT.COM	F.GTLD-SERVERS.NET
F.GTLD.BIZ	F.NIC.DE
F.NIC.TEL	F.NS.NIC.CZ
F.NS.SE	F5.NSTLD.COM
FOO.GRNET.GR	FRANKFURT.NIC.FO
FRCU.EUN.EG	FUTUNA.VANUATU.COM.VU
G-DNS.PL	G.DNS.JP
G.DNS.TW	G.EXT.NIC.FR
G.GOV.ZONEEDIT.COM	G.GTLD-SERVERS.NET
G.GTLD.BIZ	G.NIC.TEL
G.NS.SE	G.ROOT-SERVERS.NET
G3.NSTLD.COM	G5.NSTLD.COM
GNS1.DOMAINREGISTRY.IE	GNS2.DOMAINREGISTRY.IE
GOLOMB.NIC.PR	GRDNS-AIX.ICS.FORTH.GR
GRDNS-AT.ICS.FORTH.GR	GRDNS-ATH.ICS.FORTH.GR
GRDNS-BR.ICS.FORTH.GR	GRDNS-DE.DENIC.DE
GRDNS-US.ICS.FORTH.GR	GRDNS.ICS.FORTH.GR
GRNS-HER.ICS.FORTH.GR	GS1.DYNTLD.NET
GS2.DYNTLD.NET	GS3.DYNTLD.NET
GS4.DYNTLD.NET	GY-SECONDARY.JM
H-DNS.PL	H.DNS.TW
H.GTLD-SERVERS.NET	H.GTLD.BIZ
H.NIC.TEL	H.NS.SE
H.ROOT-SERVERS.NET	H3.NSTLD.COM
H5.NSTLD.COM	HAVANNAH.HARBOURMSP.COM
HIPPO.RU.AC.ZA	HOPPY.IOM.COM
HT-NS.ANYCAST.PCH.NET	I-DNS.PL
I.GTLD-SERVERS.NET	I.GTLD.BIZ
I.NIC.NO	I.NIC.TEL
I.NS.SE	I.ROOT-SERVERS.NET
ICE.NETSOURCE.IE	ICHU.RCP.NET.PE
ILDNS.HUJI.AC.IL	INS2.TOSA.TWTELECOM.NET
ITGBOX.IAT.CNR.IT	J.GTLD-SERVERS.NET
J.GTLD.BIZ	J.NIC.AT
J.NIC.TEL	J.NS.SE
JOHN.VATICAN.VA	JTB.BRUNET.BN
K.DNS.LU	K.GTLD-SERVERS.NET
K.GTLD.BIZ	K.ROOT-SERVERS.NET
KITKA.MARNET.NET.MK	KYNSE01.PERIMETERUSA.COM
KYNSE02.PERIMETERUSA.COM	KYNSE03.PERIMETERUSA.COM
KYNSW01.PERIMETERUSA.COM	KYNSW02.PERIMETERUSA.COM
KYNSW03.PERIMETERUSA.COM	L.DE.NET
L.EU.DNS.BE	L.GTLD-SERVERS.NET
L.NIC.DK	L.NIC.EU
L.ROOT-SERVERS.NET	L3.NSTLD.COM
L5.NSTLD.COM	LI1.DNSNODE.NET
LONDON.NS.DNS.BE	LOOKUP.IUCC.AC.IL
LS-NS.ANYCAST.PCH.NET	M.DNS.IT
M.GTLD-SERVERS.NET	M.NIC.EU
M.ROOT-SERVERS.NET	M3.NSTLD.COM
MANTSE.GH.COM	MARINGO.VANUATU.COM.VU
MERAPI.SWITCH.CH	MICHAEL.VATICAN.VA
MILANO.NS.DNS.BE	MINTAKA.UNIANDES.EDU.CO
MT-NS.ANYCAST.PCH.NET	MU1.DYNTLD.NET
MU2.DYNTLD.NET	MU3.DYNTLD.NET
MU4.DYNTLD.NET	MV-NS.ANYCAST.PCH.NET
N3NS.NIC.ES	NAC.NO
NAHOURI.ONATEL.BF	NAKAYO.LELAND.BJ
NAMESERVER.CNR.IT	NIC.GRNET.GR
NIC.ICOM.ORG	NIC.LK-ANYCAST.PCH.NET
NIC.MUSEUM	NJET.NORID.NO
NL1.DNSNODE.NET	NN.UNINETT.NO
NOT.NORID.NO	NP-NS.ANYCAST.PCH.NET
NRWEB.CENPAC.NET.NR	NS-A.THNIC.CO.TH
NS-AD.RIPE.NET	NS-AE.RIPE.NET
NS-AM.RIPE.NET	NS-AR.RIPE.NET
NS-BA.RIPE.NET	NS-BG.RIPE.NET
NS-BJ.RIPE.NET	NS-BN.RIPE.NET
NS-BT.RIPE.NET	NS-BY.RIPE.NET
NS-C.NIC.LK	NS-CI.RIPE.NET
NS-COM.NIC.HU	NS-CR.RIPE.NET
NS-DZ.RIPE.NET	NS-EXT.LGA1.ISC.ORG
NS-EXT.NRT1.ISC.ORG	NS-EXT.STH1.ISC.ORG
NS-EXT.VIX.COM	NS-GD.RIPE.NET
NS-GS.RIPE.NET	NS-HK.RIPE.NET
NS-IL.RIPE.NET	NS-IS.RIPE.NET
NS-JM.RIPE.NET	NS-JO.RIPE.NET
NS-KG.RIPE.NET	NS-KH.RIPE.NET
NS-KZ.RIPE.NET	NS-L.AC.LK
NS-L.NIC.LK	NS-LK.RIPE.NET
NS-LV.RIPE.NET	NS-LY.RIPE.NET
NS-MA.RIPE.NET	NS-MD.RIPE.NET
NS-MG.RIPE.NET	NS-ML.RIPE.NET
NS-MS.RIPE.NET	NS-MT.RIPE.NET
NS-MU.RIPE.NET	NS-MW.RIPE.NET
NS-MY.NIC.FR	NS-NC.RIPE.NET
NS-NL.NIC.FR	NS-NP.RIPE.NET
NS-PE.RIPE.NET	NS-PH.RIPE.NET
NS-PS.RIPE.NET	NS-PY.RIPE.NET
NS-RS.RIPE.NET	NS-S.AC.LK
NS-SA.RIPE.NET	NS-SD.RIPE.NET
NS-SE.NIC.HU	NS-SEC.RIPE.NET
NS-SM.RIPE.NET	NS-SN.RIPE.NET
NS-SOA.DARENET.DK	NS-SV.RIPE.NET
NS-T.NIC.LK	NS-TC.RIPE.NET
NS-TH.RIPE.NET	NS-TJ.RIPE.NET
NS-TO.RIPE.NET	NS-TR.RIPE.NET
NS-UA.RIPE.NET	NS-UK.NIC.AT
NS-US1.NIC.AT	NS-UY.RIPE.NET
NS-VG.RIPE.NET	NS-VI.RIPE.NET
NS-VN.RIPE.NET	NS-YU.RIPE.NET
NS-ZA.RIPE.NET	NS-ZW.RIPE.NET
NS.ANYCAST.KENIC.OR.KE	NS.ANYCAST.NIC.AF
NS.ANYCAST.NIC.CX	NS.ANYCAST.NIC.DM
NS.ANYCAST.NIC.GS	NS.ANYCAST.NIC.TL
NS.ATI.TN	NS.BA
NS.BATELCO.COM.BH	NS.CAMNET.COM.KH
NS.CERNET.NET	NS.CX-NIC.ORG.NZ
NS.DEMOS.SU	NS.DHIVEHINET.NET.MV
NS.DNS.PT	NS.DOMAIN-REGISTRY.NL
NS.DTS.MG	NS.EDU.GU
NS.EENET.EE	NS.EUNET.SK
NS.GU	NS.HORIZON.NET.FK
NS.IBW.COM.NI	NS.IDEAY.NET.NI
NS.INFOSKY.NET	NS.INTERNET.SK
NS.INTNET.NE	NS.ITU.CH
NS.JM	NS.KBFI.EE
NS.KG	NS.LANKACOM.NET
NS.MT	NS.NI
NS.NIC.BI	NS.NIC.CAT
NS.NIC.CI	NS.NIC.CL
NS.NIC.DO	NS.NIC.GE
NS.NIC.HU	NS.NIC.MC
NS.NIC.ME	NS.NIC.MG
NS.NIC.NU	NS.NIC.PA
NS.NURSAT.NET	NS.PA
NS.PIXAR.ES	NS.RICC.KZ
NS.RIPN.NET	NS.RU.NET
NS.SENTOO.SN	NS.SK-NIC.SK
NS.SPB.RU	NS.SYDNEY.COCCA.GS
NS.TELEFONICA-CA.NET	NS.THNIC.NET
NS.TMX.COM.NI	NS.TWNIC.NET
NS.UCAD.SN	NS.UCR.AC.CR
NS.UNDP.ORG	NS.UNINET.EE
NS.UNIV-NKC.MR	NS.URBE.IT
NS.UT.EE	NS.UTECHJAMAICA.EDU.JM
NS.UZ	NS0.CENTRALNIC.NET
NS0.DE.NIC.NU	NS0.PUNCHDOWN.ORG
NS0.TELIA.NIC.NU	NS02.SAVVIS.NET
NS1-AUTH.SPRINTLINK.NET	NS1.AALNET.NET
NS1.AEDNS.AE	NS1.ARNES.SI
NS1.ASAP-ASP.NET	NS1.AUDNS.NET.AU
NS1.AUSREGISTRY.NET.AU	NS1.BAHNHOF.NET
NS1.BARBADOSDOMAINS.NET	NS1.BM
NS1.BTC.BW	NS1.CENTRALNIC.NET
NS1.CESCA.ES	NS1.COBEX.NET
NS1.COMMUNITYDNS.NET	NS1.COPPERNET.ZM
NS1.COZA.NET.ZA	NS1.CS.UCL.AC.UK
NS1.DNS.AQ	NS1.DNS.LU
NS1.DNS.NET.NZ	NS1.DRUKNET.BT
NS1.GIP.NET	NS1.GRANITECANYON.COM
NS1.HKIRC.NET.HK	NS1.IAFRICA.COM
NS1.IAM.NET.MA	NS1.ID
NS1.INDO.NET.ID	NS1.ISU.NET.SA
NS1.KCCE.NET	NS1.KRNIC.NET
NS1.MAGIC.MN	NS1.MANA.PF
NS1.MT	NS1.NEOIP.COM
NS1.NET.REACH.COM	NS1.NF
NS1.NIC.BI	NS1.NIC.CI
NS1.NIC.CO	NS1.NIC.DM
NS1.NIC.ES	NS1.NIC.GM
NS1.NIC.HT	NS1.NIC.HU
NS1.NIC.IR	NS1.NIC.MP
NS1.NIC.NET.SA	NS1.NIC.RS
NS1.NIC.SC	NS1.NIC.TJ
NS1.NIC.TR	NS1.NIC.UK
NS1.OPEN.BY	NS1.ORANGECARAIBE.COM
NS1.PAIR.COM	NS1.PCH.NET
NS1.PDN.SY	NS1.PITCAIRN.NET.PN
NS1.PNINA.PS	NS1.PUNCHDOWN.NET
NS1.QATAR.NET.QA	NS1.RAD.NET.ID
NS1.REGISTRY.PW	NS1.RETINA.AR
NS1.SETARNET.AW	NS1.SK-NIC.SK
NS1.TELECOM.NET.ET	NS1.TELONE.CO.ZW
NS1.TIARE.NET.PG	NS1.TOSA.TWTELECOM.NET
NS1.UAENIC.AE	NS1.UNIVIE.AC.AT
NS1.YEMEN.NET.YE	NS1.ZAMNET.ZM
NS2.AALNET.NET	NS2.AEDNS.AE
NS2.ARNES.SI	NS2.ATI.TN
NS2.AUDNS.NET.AU	NS2.AUSREGISTRY.NET.AU
NS2.BAHNHOF.NET	NS2.BARBADOSDOMAINS.NET
NS2.BATELCO.COM.BH	NS2.BRUNET.BN
NS2.CENTRALNIC.NET	NS2.COBEX.NET
NS2.CUHK.EDU.HK	NS2.DHIVEHINET.NET.MV
NS2.DNS.PT	NS2.DNS.WS
NS2.DRUKNET.BT	NS2.FREE.NET
NS2.GIP.NET	NS2.GTT.CO.GY
NS2.HKIRC.NET.HK	NS2.IAM.NET.MA
NS2.KCCE.NET	NS2.MAGIC.MN
NS2.MANA.PF	NS2.NEOIP.COM
NS2.NF	NS2.NI
NS2.NIC.CO	NS2.NIC.DM
NS2.NIC.ES	NS2.NIC.GW
NS2.NIC.HT	NS2.NIC.HU
NS2.NIC.ME	NS2.NIC.MP
NS2.NIC.NET.SA	NS2.NIC.NL
NS2.NIC.TR	NS2.NIC.UK
NS2.OFFSHORE.AI	NS2.PDN.SY
NS2.QATAR.NET.QA	NS2.REGISTRY.HM
NS2.REGISTRY.PW	NS2.RIPN.NET
NS2.SETARNET.AW	NS2.TELECOM.NET.ET
NS2.TELONE.CO.ZW	NS2.TIARE.NET.PG
NS2.UAENIC.AE	NS2.UNDP.ORG
NS2.UNIVIE.AC.AT	NS2.YEMEN.NET.YE
NS2.ZAMNET.ZM	NS20.IIJ.AD.JP
NS3-AUTH.SPRINTLINK.NET	NS3-JM.FSL.ORG.JM
NS3.AALNET.NET	NS3.ARNES.EU
NS3.BATELCO.COM.BH	NS3.BM
NS3.CENTRALNIC.NET	NS3.CUHK.EDU.HK
NS3.DNS.NET.NZ	NS3.DNS.WS
NS3.DOMAIN-REGISTRY.NL	NS3.IAFRICA.COM
NS3.IAM.NET.MA	NS3.JARING.MY
NS3.NIC.FR	NS3.NIC.GW
NS3.NIC.HU	NS3.NIC.MP
NS3.NIC.MX	NS3.NIC.NL
NS3.NIC.TR	NS3.NIC.UK
NS3.OMNITEL.NET	NS3.QATAR.NET.QA
NS3.REGISTRY.HM	NS3.REGISTRY.PW
NS3.SK-NIC.SK	NS3.UZ
NS4.ARNES.EU	NS4.BATELCO.COM.BH
NS4.BTC.BW	NS4.CENTRALNIC.NET
NS4.DNS.NET.NZ	NS4.DNS.WS
NS4.JA.NET	NS4.MAGIC.MN
NS4.NIC.MP	NS4.NIC.NL
NS4.NIC.TR	NS4.NIC.UK
NS4.UZ	NS5.CENTRALNIC.NET
NS5.COMMUNITYDNS.NET	NS5.DNS.LU
NS5.DNS.NET.NZ	NS5.DNS.WS
NS5.JARING.MY	NS5.KNIPP.DE
NS5.MSK-IX.NET	NS5.NIC.TR
NS5.NIC.UK	NS5.UNIVIE.AC.AT
NS5.UZ	NS6.CENTRALNIC.NET
NS6.DNS.NET.NZ	NS6.DNS.WS
NS6.NIC.UK	NS7.DNS.NET.NZ
NS7.DNS.WS	NS7.NIC.UK
NS9.RIPN.NET	NS9.UNIVIE.AC.AT
NSA.CCTLDMD.NET	NSA.NIC.UK
NSB.NIC.UK	NSC.NIC.UK
NSD.NIC.UK	NSZ.NIC.LV
NSZ2.NIC.LV	NSZA.IS.CO.ZA
NYALI.INET.GA	OCEANO.UEM.MZ
ODISEJ.TELEKOM.YU	OGOOUE.INET.GA
OSI2.GUA.NET	OSIRIS.NAMEX.IT
P.NIC.DK	P.NIC.EU
PAC1.NIPR.MIL	PAC2.NIPR.MIL
PARAU.OYSTER.NET.CK	PASCAL.NIC.PR
PENDRAGON.CS.PURDUE.EDU	PHOBOS.FCCN.PT
POIPARAU.OYSTER.NET.CK	POLLUX.TELEGLOBE.NET
PR-DNS.DENIC.DE	PR-NS.ANYCAST.PCH.NET
PRAGUE.NS.DNS.BE	PRIDNS.STARHUB.NET.SG
PRIMARY.ROTLD.RO	PS-NS.ANYCAST.PCH.NET
QEW1.ADAMSNAMES.COM	QUIPU.RCP.NET.PE
R.DNS.IT	RAIN.PSG.COM
ROOT-A.TALOHA.TK	ROOT-B.TALOHA.TK
ROOT-C.TALOHA.TK	ROOT-D.TALOHA.TK
ROOT-E.TALOHA.TK	ROOT-F.TALOHA.TK
ROOT-G.TALOHA.TK	RS-NS.ANYCAST.PCH.NET
S.DE.NET	S.DNS.IT
S.NIC.DK	SA-NS.ANYCAST.PCH.NET
SAELL.CC.COLUMBIA.EDU	SAH1.YE
SAH2.YE	SANAGA.CAMNET.CM
SANTO.VANUATU.COM.VU	SAVA.UTIC.NET.BA
SAWANEW.NOC.NET.ER	SB-NS.ANYCAST.PCH.NET
SB1.DYNTLD.NET	SCE.CNC.UNA.PY
SEC2.DNS.UK.PSI.NET	SECIU.EDU.UY
SECONDARY.ROTLD.RO	SERVER.NORDU.NET
SERVER1.PUCMM.EDU.DO	SETH.NAMEX.IT
SHIKHAR.MOS.COM.NP	SLAVE.STH.NETNOD.SE
SLAVE1.STH.NETNOD.SE	SNS-PB.ISC.ORG
SOA.NIC.TL	SSS-JP.NIC.AT
SSS-NL.NIC.AT	SSS-US2.NIC.AT
SSS.ARNES.SI	SUN.REDIRIS.ES
TGSERV.TELE.GL	TJMIRROR.EASTERA.TJ
TLD1.AERODNS.AERO	TLD2.AERODNS.AERO
TLD3.ULTRADNS.ORG	TLD4.ULTRADNS.ORG
TLD5.ULTRADNS.INFO	TLD6.ULTRADNS.CO.UK
TONIC.TO	TRITON.OPT.NC
TULKU.NIC.AR	U.NIC.EU
UDNS1.TLD.MU	UMACSN1.UMAC.MO
UMACSN2.UMAC.MO	UMACSS1.UMAC.MO
UMACSS2.UMAC.MO	UMACSS3.UMAC.MO
UPR1.UPR.CLU.EDU	UTAMA.BOLNET.BO
UUCP-GW-2.PA.DEC.COM	V.NIC.EU
VPSM.BTC.BW	WHOIS.AI
X.NIC.EU	X.NIC.NO
Y.NIC.NO	YARRINA.CONNECT.COM.AU
Z.NIC.DE	Z.NIC.NO
ZEBRA.UEM.MZ	ZEINA.AUB.EDU.LB

Generic NIC sheet: Why and how monitoring your domain.

Details

We use ZoneCheck to test the Top-level domains' nameservers.

The policy of ZoneCheck is configurable. AFNIC, for instance, uses one policy to allow delegations in .fr. This monitoring tool, which is build on top of ZoneCheck, uses another one. If you install ZoneCheck locally, you can design yet another one.

Policies lists the tests to make and wether a failure is regarded as "fatal" or not (some failures are simply warnings). Any input from the community regarding the policy used here is welcome. But keep in mind that there is no consensus in the community regarding all the tests, except the most basic ones.