About 2.5 years, and 6 years ago, I did a survey to see if nameservers,
authoritative for top level domains, were in sync. I've just done it again.
Here are the results. Note that I used the Root Zone version with
SOA:2009111600 this time.
The number following the domain, is the largest difference in seconds between
nameservers responsible for the domain.
AQ. 5 CR. 505 DJ. 1271
ID. 6 GR. 659 NP. 1317
BN. 8 ET. 669 CI. 1319
YU. 8 SN. 847 MY. 1416
AR. 11 MG. 931 MV. 1451
GE. 11 CH. 971 PR. 1582
WS. 19 CX. 971 TM. 1961
MK. 27 LS. 971 KM. 2166
GH. 28 MU. 971 MZ. 2188
VU. 36 NA. 971 MA. 2308
INT. 38 PS. 971 MR. 2531
KR. 42 AE. 972 PK. 3060
GT. 45 BT. 972 BG. 3170
BI. 49 FR. 972 ER. 3279
EU. 50 GL. 972 KY. 3443
PT. 90 GS. 972 MT. 3485
TEL. 100 GY. 972 SR. 3872
BIZ. 101 HK. 972 DZ. 4442
HT. 115 MX. 972 TR. 4842
KG. 124 PM. 972 CF. 5620
SY. 135 RS. 972 CD. 5714
IE. 160 SA. 972 CG. 5715
AW. 167 SB. 972 RW. 5715
DO. 171 TL. 972 CY. 5805
PY. 190 TT. 972 GM. 6833
BF. 194 AF. 973 ZM. 8946
MW. 196 KI. 973 BS. 8993
CL. 202 LI. 973 BY. 12522
CU. 228 MS. 973 NI. 14505
GG. 232 RE. 973 GQ. 16774
JE. 232 UA. 973 TJ. 18863
SZ. 247 WF. 973 GP. 19381
BO. 260 YT. 973 TK. 19930
HR. 261 QA. 975 GA. 21271
BJ. 262 DK. 980 LY. 21967
JO. 306 AL. 989 CO. 22631
MD. 310 KE. 1003 MM. 23587
RO. 311 CAT. 1030 HM. 25117
BW. 316 UG. 1036 BA. 25821
JM. 327 AC. 1074 OM. 28411
GOV. 335 IO. 1075 AN. 29011
UY. 336 SH. 1075 PA. 35545
SV. 358 MUSEUM. 1080 DM. 39263
TG. 364 LK. 1136 YE. 43241
UZ. 370 CM. 1139 MN. 46795
EG. 387 NG. 1199 NE. 90071
VN. 429 IT. 1208 ML. 195235570
KH. 445 ZW. 1211
Below is a shame list of the nameservers that are at least one hour (3600
seconds) out of sync (in the past and future). Yes the first one is again more
than 6 years out of sync (2249 seconds more behind than 981 days ago, or a
clock skew of about 2.29256 seconds per day).
ciwara.sotelma.ML 217.64.97.50 -195217939
ns.intnet.NE 193.251.228.10 -90071
ns1.magic.MN 202.131.0.10 -46795
ns1.yemen.net.YE 65.162.184.33 -43238
ns1.nic.DM 208.0.224.114 -38292
ns2.nic.DM 208.0.224.115 -38292
ns2.PA 168.77.8.7 -35545
ns01-server.curinfo.AN 65.208.122.36 -29011
ns2.nic.CO 157.253.99.16 -22631
ns2.registry.HM 208.70.79.24 -17934
ns.NI 165.98.1.2 -11645
ns3.registry.HM 202.169.96.24 -9034
ns1.coppernet.ZM 41.222.240.15 -8910
ns1.coppernet.ZM 62.56.216.9 -8910
nyali.inet.GA 217.77.71.33 -6371
bow.intnet.CF 204.14.43.132 -5620
casbah.eldjazair.net.DZ 193.194.81.45 3860
ns2.sr.net 200.2.162.14 4248
ns3.nic.TR 213.248.162.131 4842
dns.dnsafrica.net 213.193.157.30 5715
upr1.upr.clu.edu 136.145.1.4 5735
ns1.nic.GM 194.63.250.217 6833
ns1.registry.HM 208.70.79.25 7183
root-e.taloha.TK 66.36.231.236 7508
om16.omantel.net.OM 212.72.1.186 10861
dns.belpak.BY 193.232.248.45 12520
ogooue.inet.GA 217.77.71.1 14900
sava.utic.net.BA 195.130.35.3 14993
bow.intnet.GQ 193.251.153.78 16773
ns1.nic.GP 193.218.114.2 17617
dogon.sotelma.ML 217.64.98.75 17631
root-c.taloha.TK 207.36.228.217 18322
ns2.tojikiston.com 193.111.11.4 18853
ns1.orangecaraibe.com 193.251.160.222 19381
dns1.lttnet.net 62.68.42.9 21967
ns0.mpt.net.MM 203.81.64.20 23587
ns.BA 195.130.35.5 25821
om14.omantel.net.OM 212.72.23.4 28411
Kind regards,
Roy
On Mar 13, 2007, at 5:49 PM, Roy Arends wrote:
> About 3.5 years ago, I did a survey to see if nameservers, authoritative for
> top level domains, were in sync. Those old results can be found at:
> http://www.rfc.se/fpdns/timecheck.html
>
> I ran the survey again, in the hope things have improved, but they actually
> got worse.
>
> I've included part of the text I send out back then:
>
>> Time Survey.
>>
>> As an indication, clocks at authoritative nameservers responsible for
>> the top level domains (TLDs) were compared against 'actual time'.
>>
>> As input for this exercise, the NSDNAME value in authoritative name
>> server resource records (NS) in the Root Zone (SOA:2003073101) were
>> resolved for their addresses. A unique pair of name and address is
>> regarded as a single nameserver for this survey. These nameservers were
>> queried [1] for their clock value. Not every server responded, which
>> does not imply that a name server was not running.
>
> Note that I used the Root Zone version with SOA:2007031201 this time.
>
>> A received clock value is then subtracted by the 'actual time'. This
>> actual time is the mean of recorded time 'on send' and 'on receive'.
>> The recorded time has been synchronized through NTP with a set of
>> stratum 1 time servers connected to GPS receivers.
>>
>> There is a 'response timeout' of 2 seconds which implies that there may
>> be a 2 second fault. Values outside this fault window can be considered
>> "out of sync".
>>
>> To give an indication of where a server set for a domain exist in time,
>> the 'range' is shown for a domain.
>>
>> Say the TLD example has 5 nameservers, with the following offset:
>>
>> ns1.example -50 seconds
>> ns2.example -12 seconds
>> ns3.example 1 seconds
>> ns4.example 77 seconds
>> ns3.example 150 seconds
>>
>> Then 'range' for TLD 'example' is 200 (i.e. -50 to 150).
>>
>> Only domains with a range larger then 4 seconds are mentioned below.
>>
>> Note that a single nameserver may serve multiple zones. If this single
>> nameserver is N seconds out of sync, all zones served by this server
>> will be at least N seconds out of sync.
>
> I recently re-ran the script, and the results are below. Note that I've not
> included the domains that are 4 seconds or less out of sync. Also included
> here is root, listed as a single dot.
>
> Domain Range Domain Range Domain Range
>
> YU. 8 UZ. 241 GY. 3135
> CA. 9 QA. 253 CR. 3175
> NF. 9 IR. 258 AL. 3600
> EU. 10 CM. 303 MD. 3650
> NZ. 11 CD. 318 RO. 3680
> SG. 11 RW. 318 TR. 3888
> HN. 16 CG. 319 UG. 4395
> SN. 19 TN. 348 HT. 4942
> PL. 21 VU. 402 MM. 5489
> BE. 22 AI. 410 GR. 5639
> ID. 22 LB. 415 GG. 5723
> KR. 28 MV. 474 JE. 5723
> NA. 29 LA. 480 DZ. 6136
> UA. 32 CF. 511 BH. 6496
> BB. 36 MT. 514 HM. 6620
> UY. 36 BW. 524 ZM. 6908
> MX. 41 LT. 528 BY. 7440
> GH. 57 IT. 555 MQ. 8848
> . 60 NE. 585 KH. 10051
> ARPA. 60 NP. 588 BT. 10062
> CZ. 61 EC. 591 GQ. 12903
> DO. 61 MUSEUM. 696 BO. 14806
> BD. 63 BZ. 726 JO. 15818
> PS. 73 MZ. 737 DM. 15980
> TH. 88 OM. 739 GA. 16104
> DJ. 95 CI. 755 TJ. 17614
> LK. 100 NR. 757 TK. 17982
> SB. 126 INT. 805 BA. 21441
> CC. 133 SZ. 849 LY. 24933
> ET. 133 VA. 989 BJ. 25914
> NAME. 133 BI. 1035 YE. 28724
> EDU. 134 ER. 1145 PA. 35999
> JOBS. 134 TL. 1156 PK. 39921
> TV. 134 EG. 1212 SV. 43450
> GOV. 152 MR. 1487 VN. 45078
> AT. 153 AD. 1532 GP. 89182
> MK. 159 EE. 1591 AC. 89940
> KM. 182 MY. 1671 TM. 89940
> CAT. 189 MA. 1678 IO. 89941
> GB. 189 JM. 1840 SH. 89941
> KG. 204 TG. 2054 BF. 114772
> GF. 205 NI. 2273 SY. 123066
> MG. 214 CY. 2519 KW. 330786
> BS. 228 SL. 2545 ML. 195229906
>
> Below is a shame list of the nameservers that are at least one hour (3600
> seconds) out of sync (in the past and future). Yes the first one is more than
> 6 years out of sync.
>
> ciwara.sotelma.ml 217.64.97.50 -195220188
> castor.teleglobe.net 199.202.55.2 -115866
> ns1.orangecaraibe.com 193.251.160.222 -75305
> ns.telefonica-ca.net 216.184.96.4 -43296
> ns2.pa 168.77.8.7 -35845
> utama.bolnet.bo 166.114.1.40 -14805
> manta.outremer.com 213.16.1.106 -9044
> ns2.registry.hm 209.245.20.115 -8077
> ns3.registry.hm 202.169.96.24 -5407
> ns1.nic.ht 64.86.226.26 -4941
> ns2.druknet.bt 202.144.128.210 -4163
> web.eahd.or.ug 216.104.202.101 -3778
> ns2.batelco.com.bh 193.188.97.212 -3694
> itgbox.iat.cnr.it 146.48.65.46 3601
> casbah.eldjazair.net.dz 193.194.81.45 3773
> ns5.nic.tr 213.139.255.18 3889
> ns1.microlink.zm 193.220.20.30 4378
> grdns-us.ics.forth.gr 192.0.34.138 5509
> ns1.druknet.bt 202.144.128.200 5899
> ns1.zamnet.zm 196.46.192.26 6137
> nyali.inet.ga 217.77.71.33 6412
> dns2.net.sy 66.198.41.14 7200
> dns.belpak.by 193.232.248.45 7441
> dogon.sotelma.ml 217.64.98.75 9718
> ns.camnet.com.kh 203.223.32.3 10051
> bow.intnet.gq 193.251.153.78 12904
> ns1.nic.gp 193.218.114.2 13877
> petra.nic.gov.jo 193.188.66.2 14408
> ns1.nic.dm 208.0.224.114 14471
> ogooue.inet.ga 217.77.71.1 16105
> ns.tojikiston.com 193.111.11.2 17614
> root-c.taloha.tk 207.36.228.217 17982
> ns.ba 195.130.35.5 21441
> ns0.mpt.net.mm 203.81.64.20 21760
> dns1.lttnet.net 62.68.42.9 24771
> dns.lttnet.net 62.240.36.9 24934
> nakayo.leland.bj 81.91.225.1 25915
> dns2.kw 161.252.48.150 27045
> ns1.mpt.net.mm 203.81.64.19 27249
> sah2.ye 195.94.0.35 28656
> ns.pknic.net.pk 207.44.136.109 39922
> dns-hcm01.vnnic.net.vn 203.162.87.66 45079
> ns3.icb.co.uk 217.199.188.61 88287
> ns3.icb.co.uk 217.199.188.61 88288
> dns1.kw 161.252.48.140 330833
>
> Regards,
>
> Roy
>
>
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