NTS pool status & monitoring
Real-time view of our NTS pool, probed every 5 minutes: availability, clock drift (offset), stratum and TLS certificate of each server — filterable by datacenter and by transit network (ASN).
17 + 8
Servers + pool
17/17
Reachable
16/16
NTS-KE OK
16/16
Authenticated time
36 j
Min cert
2 min
Updated
The offset shown is the gap measured between the server clock and our probe clock (web-01, itself synchronised). Values are in milliseconds; the sparkline shows 24 h drift. NTS-KE is probed over TLS 1.3 (ALPN
ntske/1, port 4460); time is queried via SNTP (port 123, best of 5 samples / lowest RTT). A residual offset on a single protocol (v4 or v6) usually reflects routing asymmetry, not clock drift.
Datacenter
Network (ASN)
🇫🇷 Paris PA4 3 servers
ntp-1.rdem-systems.com
server
rtr-01.pa4
Stratum2
RTT0.8 ms
Offset v4+0.995 ms
Offset v6+1.030 ms
24 h drift (offset v4, ms)
+1.93+0.31
min +0.31avg +1.02med +1.05max +1.93ms
Certificate*.rdem-systems.com
Issued byLet's Encrypt / YE2
Expiryin 36 d
A3:9E:5B:37:21:01:C0:9C:F6:24:A4:52…
ntp-2.rdem-systems.com
server
rtr-02.pa4
Stratum2
RTT1.0 ms
Offset v4+0.702 ms
Offset v6+0.670 ms
24 h drift (offset v4, ms)
+1.26−0.01
min −0.01avg +0.73med +0.77max +1.26ms
Certificate*.rdem-systems.com
Issued byLet's Encrypt / YE2
Expiryin 36 d
A3:9E:5B:37:21:01:C0:9C:F6:24:A4:52…
ntp-9.rdem-systems.com
server
ns-arelion
Stratum2
RTT1.5 ms
Offset v4-0.170 ms
Offset v6-0.212 ms
24 h drift (offset v4, ms)
+0.92−0.69
min −0.69avg +0.02med +0.03max +0.92ms
Certificate*.rdem-systems.com
Issued byLet's Encrypt / YE2
Expiryin 36 d
A3:9E:5B:37:21:01:C0:9C:F6:24:A4:52…
🇫🇷 Paris PA3 3 servers
ntp-3.rdem-systems.com
server
rtr-01.pa3
Stratum2
RTT1.0 ms
Offset v4+0.624 ms
Offset v6+0.589 ms
24 h drift (offset v4, ms)
+1.08−0.03
min −0.03avg +0.72med +0.75max +1.08ms
Certificate*.rdem-systems.com
Issued byLet's Encrypt / YE2
Expiryin 36 d
A3:9E:5B:37:21:01:C0:9C:F6:24:A4:52…
ntp-4.rdem-systems.com
server
rtr-02.pa3
Stratum2
RTT0.9 ms
Offset v4+0.551 ms
Offset v6+0.604 ms
24 h drift (offset v4, ms)
+0.84−0.56
min −0.56avg +0.22med +0.23max +0.84ms
Certificate*.rdem-systems.com
Issued byLet's Encrypt / YE2
Expiryin 36 d
A3:9E:5B:37:21:01:C0:9C:F6:24:A4:52…
ntp-10.rdem-systems.com
server
ns-ielo
Stratum2
RTT1.5 ms
Offset v4-0.055 ms
Offset v6-0.028 ms
24 h drift (offset v4, ms)
+0.62−0.86
min −0.86avg −0.06med −0.03max +0.62ms
Certificate*.rdem-systems.com
Issued byLet's Encrypt / YE2
Expiryin 36 d
A3:9E:5B:37:21:01:C0:9C:F6:24:A4:52…
🇫🇷 Paris PA5 3 servers
ntp-5.rdem-systems.com
server
rtr-01.pa5
Stratum2
RTT0.5 ms
Offset v4+0.642 ms
Offset v6+0.652 ms
24 h drift (offset v4, ms)
+1.28−0.21
min −0.21avg +0.63med +0.67max +1.28ms
Certificate*.rdem-systems.com
Issued byLet's Encrypt / YE2
Expiryin 36 d
A3:9E:5B:37:21:01:C0:9C:F6:24:A4:52…
ntp-6.rdem-systems.com
server
rtr-02.pa5
Stratum2
RTT0.7 ms
Offset v4+1.203 ms
Offset v6+1.139 ms
24 h drift (offset v4, ms)
+1.48−0.10
min −0.10avg +0.90med +0.95max +1.48ms
Certificate*.rdem-systems.com
Issued byLet's Encrypt / YE2
Expiryin 36 d
A3:9E:5B:37:21:01:C0:9C:F6:24:A4:52…
ntp-8.rdem-systems.com
server
ns-rds
Stratum2
RTT0.5 ms
Offset v4+0.219 ms
Offset v6+0.244 ms
24 h drift (offset v4, ms)
+0.75−0.82
min −0.82avg +0.16med +0.23max +0.75ms
Certificate*.rdem-systems.com
Issued byLet's Encrypt / YE2
Expiryin 36 d
A3:9E:5B:37:21:01:C0:9C:F6:24:A4:52…
🇫🇷 Paris TH2 1 servers
ntp-11.rdem-systems.com
server
ns-ipset
Stratum2
RTT13.9 ms
Offset v4-1.195 ms
Offset v6-1.106 ms
24 h drift (offset v4, ms)
−0.59−2.30
min −2.30avg −1.47med −1.45max −0.59ms
Certificate*.rdem-systems.com
Issued byLet's Encrypt / YE2
Expiryin 36 d
A3:9E:5B:37:21:01:C0:9C:F6:24:A4:52…
🇩🇪 Frankfurt (OVH) 2 servers
ntp-7.rdem-systems.com
server
backup01.fra.de
Stratum2
RTT17.0 ms
Offset v4-2.509 ms
Offset v6-2.451 ms
24 h drift (offset v4, ms)
+1.76−3.47
min −3.47avg −2.64med −2.66max +1.76ms
Certificate*.rdem-systems.com
Issued byLet's Encrypt / YE2
Expiryin 36 d
A3:9E:5B:37:21:01:C0:9C:F6:24:A4:52…
ntp-13.rdem-systems.com
server
host-01.fra.de
Stratum2
RTT17.0 ms
Offset v4-2.477 ms
Offset v6-2.476 ms
24 h drift (offset v4, ms)
−2.03−4.64
min −4.64avg −2.82med −2.76max −2.03ms
Certificate*.rdem-systems.com
Issued byLet's Encrypt / YE2
Expiryin 36 d
A3:9E:5B:37:21:01:C0:9C:F6:24:A4:52…
🇫🇷 HQ (Île-de-France) 1 servers
ntp-0.rdem-systems.com
server
ntp-0.hq
Stratum1
RTT3.4 ms
Offset v4+0.023 ms
Offset v6—
24 h drift (offset v4, ms)
+0.71−1.84
min −1.84avg −0.82med −0.86max +0.71ms
ⓘ NTP-only — NTS planned (chrony pending)
🇫🇷 Contabo (FR) 1 servers
ntp-12.rdem-systems.com
server
ns-contabo
Stratum2
RTT8.3 ms
Offset v4+0.972 ms
Offset v6+0.864 ms
24 h drift (offset v4, ms)
+2.13−0.98
min −0.98avg +0.65med +0.56max +2.13ms
Certificate*.rdem-systems.com
Issued byLet's Encrypt / YE2
Expiryin 36 d
A3:9E:5B:37:21:01:C0:9C:F6:24:A4:52…
🇫🇷 Lyon (IPSET) 1 servers
ntp-14.rdem-systems.com
server
nsr-1.ipset
Stratum2
RTT7.4 ms
Offset v4+1.001 ms
Offset v6+1.019 ms
24 h drift (offset v4, ms)
+1.39−0.14
min −0.14avg +0.65med +0.66max +1.39ms
Certificate*.rdem-systems.com
Issued byLet's Encrypt / YE2
Expiryin 36 d
A3:9E:5B:37:21:01:C0:9C:F6:24:A4:52…
🇫🇷 Valence (IPSET) 1 servers
ntp-15.rdem-systems.com
server
nsr-2.ipset
Stratum2
RTT8.9 ms
Offset v4+1.034 ms
Offset v6+0.984 ms
24 h drift (offset v4, ms)
+1.49−0.06
min −0.06avg +0.68med +0.73max +1.49ms
Certificate*.rdem-systems.com
Issued byLet's Encrypt / YE2
Expiryin 36 d
A3:9E:5B:37:21:01:C0:9C:F6:24:A4:52…
🇫🇷 Paris (IPSET) 1 servers
ntp-16.rdem-systems.com
server
nsr-3.ipset
Stratum2
RTT14.1 ms
Offset v4+0.352 ms
Offset v6+0.403 ms
24 h drift (offset v4, ms)
+0.74−0.77
min −0.77avg +0.05med +0.08max +0.74ms
Certificate*.rdem-systems.com
Issued byLet's Encrypt / YE2
Expiryin 36 d
A3:9E:5B:37:21:01:C0:9C:F6:24:A4:52…
🌐 Pool entries (load-balanced) 8
ntp-pool.rdem-systems.com
pool
anycast / 16×A
24 h drift (offset v4, ms) · 16 servers
ntp-1
+0.995 ms
in 36 d
ntp-2
+0.702 ms
in 36 d
ntp-9
-0.170 ms
in 36 d
ntp-3
+0.624 ms
in 36 d
ntp-4
+0.551 ms
in 36 d
ntp-10
-0.055 ms
in 36 d
ntp-5
+0.642 ms
in 36 d
ntp-6
+1.203 ms
in 36 d
ntp-8
+0.219 ms
in 36 d
ntp-11
-1.195 ms
in 36 d
ntp-7
-2.509 ms
in 36 d
ntp-13
-2.477 ms
in 36 d
ntp-12
+0.972 ms
in 36 d
ntp-14
+1.001 ms
in 36 d
ntp-15
+1.034 ms
in 36 d
ntp-16
+0.352 ms
in 36 d
Certificate (pool SNI)16/16 members OK
Expiryin 36 d
DNS resolution16×A · 16×AAAA
pa3.ntp-pool.rdem-systems.com
pool
pool PA3
24 h drift (offset v4, ms) · 3 servers
ntp-3
+0.624 ms
in 36 d
ntp-4
+0.551 ms
in 36 d
ntp-10
-0.055 ms
in 36 d
Certificate (pool SNI)3/3 members OK
Expiryin 36 d
DNS resolution3×A · 3×AAAA
pa4.ntp-pool.rdem-systems.com
pool
pool PA4
24 h drift (offset v4, ms) · 3 servers
ntp-1
+0.995 ms
in 36 d
ntp-2
+0.702 ms
in 36 d
ntp-9
-0.170 ms
in 36 d
Certificate (pool SNI)3/3 members OK
Expiryin 36 d
DNS resolution3×A · 3×AAAA
pa5.ntp-pool.rdem-systems.com
pool
pool PA5
24 h drift (offset v4, ms) · 3 servers
ntp-5
+0.642 ms
in 36 d
ntp-6
+1.203 ms
in 36 d
ntp-8
+0.219 ms
in 36 d
Certificate (pool SNI)3/3 members OK
Expiryin 36 d
DNS resolution3×A · 3×AAAA
ielo.ntp-pool.rdem-systems.com
pool
pool IELO
24 h drift (offset v4, ms) · 5 servers
ntp-3
+0.624 ms
in 36 d
ntp-4
+0.551 ms
in 36 d
ntp-10
-0.055 ms
in 36 d
ntp-5
+0.642 ms
in 36 d
ntp-6
+1.203 ms
in 36 d
Certificate (pool SNI)5/5 members OK
Expiryin 36 d
DNS resolution5×A · 3×AAAA
arelion.ntp-pool.rdem-systems.com
pool
pool Arelion
24 h drift (offset v4, ms) · 3 servers
ntp-1
+0.995 ms
in 36 d
ntp-2
+0.702 ms
in 36 d
ntp-9
-0.170 ms
in 36 d
Certificate (pool SNI)3/3 members OK
Expiryin 36 d
DNS resolution3×A · 2×AAAA
ipset.ntp-pool.rdem-systems.com
pool
pool IPSET
24 h drift (offset v4, ms) · 5 servers
ntp-2
+0.702 ms
in 36 d
ntp-11
-1.195 ms
in 36 d
ntp-14
+1.001 ms
in 36 d
ntp-15
+1.034 ms
in 36 d
ntp-16
+0.352 ms
in 36 d
Certificate (pool SNI)5/5 members OK
Expiryin 36 d
DNS resolution5×A · 5×AAAA
ovh.ntp-pool.rdem-systems.com
pool
pool OVH
24 h drift (offset v4, ms) · 2 servers
ntp-7
-2.509 ms
in 36 d
ntp-13
-2.477 ms
in 36 d
Certificate (pool SNI)2/2 members OK
Expiryin 36 d
DNS resolution2×A · 2×AAAA
About this monitoring
This page reflects an independent probe run every 5 minutes from our infrastructure.
To understand the offering behind this pool, see NTS (Network Time Security).
You can also check your machine's clock
or view our NTP Pool score.
Need demonstrable UTC traceability for compliance (MiFID II, PCI-DSS, NIS2)?
See our UTC time-traceability audit.
And to measure your NTP servers the same way, with a sealed monthly report to hand to
your auditor: Time Evidence.
This data is downloadable
The snapshot shown above is available as JSON:
/downloads/nts-status.php
— same data, same freshness (5 minutes), method and licence embedded in the file.
Scope, to be honest about it: this feed measures our own infrastructure. It is
self-reported, and that is its limit. For third-party measurement from six independent networks, see the
European registry of NTP/NTS servers.
To cite: RDEM Systems (2026). RDEM Systems NTS pool monitoring feed.
Licensed CC BY 4.0.
https://ntp.rdem-systems.com/en/status.php
Free NTP Tools
Three independent tools to diagnose your time synchronization: