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r4 - 2005-01-26 - 07:50:03 - AdrianVonBidderYou are here: NTP >  Servers Web > NTPPoolServers
NTP users are strongly urged to take immediate action to ensure that their NTP daemons are not susceptible to being used in distributed denial-of-service (DDoS) attacks. Please also take this opportunity to defeat denial-of-service attacks by implementing Ingress and Egress filtering through BCP38.

ntp-4.2.8p13 was released on 07 March 2019. It addresses 1 medium-severity security issue in ntpd, and provides 17 non-security bugfixes and 1 other improvements over 4.2.8p12.

Please see the NTP Security Notice for vulnerability and mitigation details.

Are you using Autokey in production? If so, please contact Harlan - he's got some questions for you.

NTP Pool Time Servers

pool.ntp.org uses DNS round robin to make a random selection from a pool of OpenAccess time servers. This is often good enough for end-users. The minimal ntpd configuration file (e.g. /etc/ntpd.conf) for using pool.ntp.org is:

driftfile /var/lib/ntp/ntp.drift

server pool.ntp.org
server pool.ntp.org
server pool.ntp.org
server pool.ntp.org

UPDATED If you have a buggy DNS name resolver which doesn't properly do round robin ('ntpq -pn' shows the same server three times) you can use 0.pool.ntp.org, 1.pool.ntp.org and 2.pool.ntp.org. For users of pool.ntp.org zones, there are now also 0, 1 and 2.<zone> subzones. If enough servers are available, the subzones won't overlap (currently only europe and the global zone), for the other zones, some servers may be present in more than one subzone.

ALERT! Any questions about the pool.ntp.org server pool should be directed either to the timekeepers@fortytwo.ch mailing list or to the comp.protocols.time.ntp usenet newsgroup.

IDEA! Time server operators are encouraged to visit the pool.ntp.org web-site to find out how they can support the NTP pool.

To make it possible to select a timeserver which is geographically close, subzones of pool.ntp.org have been created (as of 26.1.2005):

ISO: Area: HostName:
Worldwide pool.ntp.org
Asia asia.pool.ntp.org
Europe europe.pool.ntp.org
North America north-america.pool.ntp.org
Oceania oceania.pool.ntp.org
South America south-america.pool.ntp.org
AT Austria at.pool.ntp.org
AU Australia au.pool.ntp.org
BE Belgium be.pool.ntp.org
BR Brazil br.pool.ntp.org
CA Canada ca.pool.ntp.org
CH Switzerland ch.pool.ntp.org
CL Chile cl.pool.ntp.org
DE Germany de.pool.ntp.org
DK Denmark dk.pool.ntp.org
ES Spain es.pool.ntp.org
FI Finland fi.pool.ntp.org
FR France fr.pool.ntp.org
GT Guatemala gt.pool.ntp.org
IE Ireland ie.pool.ntp.org
IL Israel il.pool.ntp.org
IT Italy it.pool.ntp.org
JP Japan jp.pool.ntp.org
MX Mexico mx.pool.ntp.org
MY Malaysia my.pool.ntp.org
NL Netherland nl.pool.ntp.org
NO Norway no.pool.ntp.org
NZ New Zealand nz.pool.ntp.org
PH Philippines ph.pool.ntp.org
PL Poland pl.pool.ntp.org
PT Portugal pt.pool.ntp.org
RU Russia ru.pool.ntp.org
SE Sweden se.pool.ntp.org
SG Singapore sg.pool.ntp.org
SI Slovenia si.pool.ntp.org
TR Turkey tr.pool.ntp.org
UK Great Britain uk.pool.ntp.org
US USA us.pool.ntp.org

When using the by-country zones (or the asia.pool.ntp.org by-continent zone), be careful: some of them currently contain only one or two servers, so you are probably better off using either the zone of a nearby country, or using the continent or global zone (This is also valid if you live in a big country. For example, my.pool.ntp.org has only one server).

Related topics: RulesOfEngagement, StratumTwoTimeServers, ManagingYourListEntries, SubmittingYourListEntriesViaEmail, http://www.pool.ntp.org

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