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).
13 + 7
Servers + pool
13/13
Reachable
12/12
NTS-KE OK
12/12
Authenticated time
36 j
Min cert
3 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
RTT0.6 ms
Offset v4+0.848 ms
Offset v6+0.874 ms
24 h drift (offset v4, ms)
+2.15+0.26
min +0.26avg +0.98med +0.91max +2.15ms
Certificate*.rdem-systems.com
Issued byLet's Encrypt / YE1
Expiryin 36 d
9E:D2:E2:BA:D9:43:DF:45:15:D1:F1:7F…
ntp-2.rdem-systems.com
server
rtr-02.pa4
Stratum2
RTT0.9 ms
Offset v4+0.493 ms
Offset v6+0.433 ms
24 h drift (offset v4, ms)
+1.68−0.17
min −0.17avg +0.52med +0.49max +1.68ms
Certificate*.rdem-systems.com
Issued byLet's Encrypt / YE1
Expiryin 36 d
9E:D2:E2:BA:D9:43:DF:45:15:D1:F1:7F…
ntp-9.rdem-systems.com
server
ns-arelion
Stratum2
RTT1.3 ms
Offset v4-0.060 ms
Offset v6-0.022 ms
24 h drift (offset v4, ms)
+1.34−0.90
min −0.90avg +0.04med −0.00max +1.34ms
Certificate*.rdem-systems.com
Issued byLet's Encrypt / YE1
Expiryin 36 d
9E:D2:E2:BA:D9:43:DF:45:15:D1:F1:7F…
🇫🇷 Paris PA3 3 servers
ntp-3.rdem-systems.com
server
rtr-01.pa3
Stratum2
RTT0.9 ms
Offset v4-0.132 ms
Offset v6-0.163 ms
24 h drift (offset v4, ms)
+1.22−0.56
min −0.56avg +0.11med +0.08max +1.22ms
Certificate*.rdem-systems.com
Issued byLet's Encrypt / YE1
Expiryin 36 d
9E:D2:E2:BA:D9:43:DF:45:15:D1:F1:7F…
ntp-4.rdem-systems.com
server
rtr-02.pa3
Stratum2
RTT0.8 ms
Offset v4+0.497 ms
Offset v6+0.502 ms
24 h drift (offset v4, ms)
+1.39−0.17
min −0.17avg +0.49med +0.43max +1.39ms
Certificate*.rdem-systems.com
Issued byLet's Encrypt / YE1
Expiryin 36 d
9E:D2:E2:BA:D9:43:DF:45:15:D1:F1:7F…
ntp-10.rdem-systems.com
server
ns-ielo
Stratum2
RTT1.4 ms
Offset v4+0.056 ms
Offset v6-0.044 ms
24 h drift (offset v4, ms)
+1.27−0.41
min −0.41avg +0.06med +0.04max +1.27ms
Certificate*.rdem-systems.com
Issued byLet's Encrypt / YE1
Expiryin 36 d
9E:D2:E2:BA:D9:43:DF:45:15:D1:F1:7F…
🇫🇷 Paris PA5 3 servers
ntp-5.rdem-systems.com
server
rtr-01.pa5
Stratum2
RTT0.4 ms
Offset v4-0.172 ms
Offset v6-0.224 ms
24 h drift (offset v4, ms)
+0.92−0.94
min −0.94avg −0.11med −0.14max +0.92ms
Certificate*.rdem-systems.com
Issued byLet's Encrypt / YE1
Expiryin 36 d
9E:D2:E2:BA:D9:43:DF:45:15:D1:F1:7F…
ntp-6.rdem-systems.com
server
rtr-02.pa5
Stratum2
RTT0.8 ms
Offset v4+0.829 ms
Offset v6+0.786 ms
24 h drift (offset v4, ms)
+2.25+0.10
min +0.10avg +1.07med +0.99max +2.25ms
Certificate*.rdem-systems.com
Issued byLet's Encrypt / YE1
Expiryin 36 d
9E:D2:E2:BA:D9:43:DF:45:15:D1:F1:7F…
ntp-8.rdem-systems.com
server
ns-rds
Stratum2
RTT0.4 ms
Offset v4+0.774 ms
Offset v6+0.761 ms
24 h drift (offset v4, ms)
+1.89+0.03
min +0.03avg +1.02med +1.00max +1.89ms
Certificate*.rdem-systems.com
Issued byLet's Encrypt / YE1
Expiryin 36 d
9E:D2:E2:BA:D9:43:DF:45:15:D1:F1:7F…
🇫🇷 Paris TH2 1 servers
ntp-11.rdem-systems.com
server
ns-ipset
Stratum2
RTT13.9 ms
Offset v4-0.670 ms
Offset v6-0.818 ms
24 h drift (offset v4, ms)
+0.93−1.21
min −1.21avg −0.32med −0.35max +0.93ms
Certificate*.rdem-systems.com
Issued byLet's Encrypt / YE1
Expiryin 36 d
9E:D2:E2:BA:D9:43:DF:45:15:D1:F1:7F…
🇩🇪 Frankfurt (OVH) 1 servers
ntp-7.rdem-systems.com
server
backup01.fra.de
Stratum2
RTT17.2 ms
Offset v4-2.450 ms
Offset v6-2.463 ms
24 h drift (offset v4, ms)
−1.30−3.58
min −3.58avg −2.72med −2.75max −1.30ms
Certificate*.rdem-systems.com
Issued byLet's Encrypt / YE1
Expiryin 36 d
9E:D2:E2:BA:D9:43:DF:45:15:D1:F1:7F…
🇫🇷 HQ (Île-de-France) 1 servers
ntp-0.rdem-systems.com
server
ntp-0.hq
Stratum1
RTT3.6 ms
Offset v4-0.272 ms
Offset v6—
24 h drift (offset v4, ms)
+1.47−3.81
min −3.81avg −1.08med −1.08max +1.47ms
ⓘ NTP-only — NTS planned (chrony pending)
🇫🇷 Contabo (FR) 1 servers
ntp-12.rdem-systems.com
server
ns-contabo
Stratum2
RTT8.2 ms
Offset v4+0.347 ms
Offset v6+0.479 ms
24 h drift (offset v4, ms)
+1.66−0.96
min −0.96avg +0.48med +0.55max +1.66ms
Certificate*.rdem-systems.com
Issued byLet's Encrypt / YE1
Expiryin 36 d
9E:D2:E2:BA:D9:43:DF:45:15:D1:F1:7F…
🌐 Pool entries (load-balanced) 7
ntp-pool.rdem-systems.com
pool
anycast / 11×A
24 h drift (offset v4, ms) · 11 servers
ntp-1
+0.848 ms
in 36 d
ntp-2
+0.493 ms
in 36 d
ntp-9
-0.060 ms
in 36 d
ntp-3
-0.132 ms
in 36 d
ntp-4
+0.497 ms
in 36 d
ntp-10
+0.056 ms
in 36 d
ntp-5
-0.172 ms
in 36 d
ntp-6
+0.829 ms
in 36 d
ntp-8
+0.774 ms
in 36 d
ntp-11
-0.670 ms
in 36 d
ntp-7
-2.450 ms
in 36 d
Certificate (pool SNI)11/11 members OK
Expiryin 36 d
DNS resolution12×A · 12×AAAA
pa3.ntp-pool.rdem-systems.com
pool
pool PA3
24 h drift (offset v4, ms) · 3 servers
ntp-3
-0.132 ms
in 36 d
ntp-4
+0.497 ms
in 36 d
ntp-10
+0.056 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
+0.848 ms
in 36 d
ntp-2
+0.493 ms
in 36 d
ntp-9
-0.060 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
-0.172 ms
in 36 d
ntp-6
+0.829 ms
in 36 d
ntp-8
+0.774 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
-0.132 ms
in 36 d
ntp-4
+0.497 ms
in 36 d
ntp-10
+0.056 ms
in 36 d
ntp-5
-0.172 ms
in 36 d
ntp-6
+0.829 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
+0.848 ms
in 36 d
ntp-2
+0.493 ms
in 36 d
ntp-9
-0.060 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) · 2 servers
ntp-2
+0.493 ms
in 36 d
ntp-11
-0.670 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.
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: