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
47 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+1.208 ms
Offset v6+1.164 ms
24 h drift (offset v4, ms)
+1.25−0.39
min −0.39avg +0.62med +0.64max +1.25ms
Certificate*.rdem-systems.com
Issued byLet's Encrypt / YE2
Expiryin 47 d
A3:9E:5B:37:21:01:C0:9C:F6:24:A4:52…
ntp-2.rdem-systems.com
server
rtr-02.pa4
Stratum2
RTT0.9 ms
Offset v4+1.216 ms
Offset v6+1.243 ms
24 h drift (offset v4, ms)
+1.24−0.76
min −0.76avg +0.11med +0.19max +1.24ms
Certificate*.rdem-systems.com
Issued byLet's Encrypt / YE2
Expiryin 47 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+1.204 ms
Offset v6+1.105 ms
24 h drift (offset v4, ms)
+1.16−0.64
min −0.64avg +0.05med +0.04max +1.16ms
Certificate*.rdem-systems.com
Issued byLet's Encrypt / YE2
Expiryin 47 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
RTT0.9 ms
Offset v4+0.613 ms
Offset v6+0.596 ms
24 h drift (offset v4, ms)
+0.47−0.99
min −0.99avg −0.15med −0.07max +0.47ms
Certificate*.rdem-systems.com
Issued byLet's Encrypt / YE2
Expiryin 47 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+0.859 ms
Offset v6+0.831 ms
24 h drift (offset v4, ms)
+0.86−1.69
min −1.69avg −0.75med −1.08max +0.86ms
Certificate*.rdem-systems.com
Issued byLet's Encrypt / YE2
Expiryin 47 d
A3:9E:5B:37:21:01:C0:9C:F6:24:A4:52…
ntp-10.rdem-systems.com
server
ns-ielo
Stratum2
RTT1.3 ms
Offset v4+0.577 ms
Offset v6+0.542 ms
24 h drift (offset v4, ms)
+0.50−0.71
min −0.71avg −0.05med −0.03max +0.50ms
Certificate*.rdem-systems.com
Issued byLet's Encrypt / YE2
Expiryin 47 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
RTT0.4 ms
Offset v4+0.714 ms
Offset v6+0.740 ms
24 h drift (offset v4, ms)
+0.70−1.34
min −1.34avg −0.20med −0.17max +0.70ms
Certificate*.rdem-systems.com
Issued byLet's Encrypt / YE2
Expiryin 47 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+1.017 ms
Offset v6+1.013 ms
24 h drift (offset v4, ms)
+1.13−0.38
min −0.38avg +0.35med +0.34max +1.13ms
Certificate*.rdem-systems.com
Issued byLet's Encrypt / YE2
Expiryin 47 d
A3:9E:5B:37:21:01:C0:9C:F6:24:A4:52…
ntp-8.rdem-systems.com
server
ns-rds
Stratum2
RTT0.4 ms
Offset v4+1.038 ms
Offset v6+1.000 ms
24 h drift (offset v4, ms)
+1.05−0.34
min −0.34avg +0.35med +0.33max +1.05ms
Certificate*.rdem-systems.com
Issued byLet's Encrypt / YE2
Expiryin 47 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
RTT14.1 ms
Offset v4+1.111 ms
Offset v6+1.071 ms
24 h drift (offset v4, ms)
+1.13−0.44
min −0.44avg +0.22med +0.24max +1.13ms
Certificate*.rdem-systems.com
Issued byLet's Encrypt / YE2
Expiryin 47 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
RTT16.8 ms
Offset v4-1.279 ms
Offset v6-1.270 ms
24 h drift (offset v4, ms)
−1.33−3.55
min −3.55avg −2.62med −2.64max −1.33ms
Certificate*.rdem-systems.com
Issued byLet's Encrypt / YE2
Expiryin 47 d
A3:9E:5B:37:21:01:C0:9C:F6:24:A4:52…
ntp-13.rdem-systems.com
server
host-01.fra.de
Stratum2
RTT16.7 ms
Offset v4-1.925 ms
Offset v6-2.043 ms
24 h drift (offset v4, ms)
−1.71−4.58
min −4.58avg −2.80med −2.79max −1.71ms
Certificate*.rdem-systems.com
Issued byLet's Encrypt / YE2
Expiryin 47 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
RTT3.7 ms
Offset v4+0.564 ms
Offset v6—
24 h drift (offset v4, ms)
+0.67−1.95
min −1.95avg −0.83med −0.90max +0.67ms
ⓘ NTP-only — NTS planned (chrony pending)
🇫🇷 Contabo (FR) 1 servers
ntp-12.rdem-systems.com
server
ns-contabo
Stratum2
RTT8.2 ms
Offset v4+1.028 ms
Offset v6+1.147 ms
24 h drift (offset v4, ms)
+1.69−1.63
min −1.63avg +0.41med +0.35max +1.69ms
Certificate*.rdem-systems.com
Issued byLet's Encrypt / YE2
Expiryin 47 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+1.671 ms
Offset v6+1.564 ms
24 h drift (offset v4, ms)
+1.73+0.04
min +0.04avg +0.71med +0.76max +1.73ms
Certificate*.rdem-systems.com
Issued byLet's Encrypt / YE2
Expiryin 47 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
RTT9.0 ms
Offset v4+0.824 ms
Offset v6+0.914 ms
24 h drift (offset v4, ms)
+0.91−0.47
min −0.47avg +0.20med +0.20max +0.91ms
Certificate*.rdem-systems.com
Issued byLet's Encrypt / YE2
Expiryin 47 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
RTT14.2 ms
Offset v4+0.169 ms
Offset v6-0.011 ms
24 h drift (offset v4, ms)
+0.14−1.61
min −1.61avg −0.98med −0.95max +0.14ms
Certificate*.rdem-systems.com
Issued byLet's Encrypt / YE2
Expiryin 47 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
+1.208 ms
in 47 d
ntp-2
+1.216 ms
in 47 d
ntp-9
+1.204 ms
in 47 d
ntp-3
+0.613 ms
in 47 d
ntp-4
+0.859 ms
in 47 d
ntp-10
+0.577 ms
in 47 d
ntp-5
+0.714 ms
in 47 d
ntp-6
+1.017 ms
in 47 d
ntp-8
+1.038 ms
in 47 d
ntp-11
+1.111 ms
in 47 d
ntp-7
-1.279 ms
in 47 d
ntp-13
-1.925 ms
in 47 d
ntp-12
+1.028 ms
in 47 d
ntp-14
+1.671 ms
in 47 d
ntp-15
+0.824 ms
in 47 d
ntp-16
+0.169 ms
in 47 d
Certificate (pool SNI)16/16 members OK
Expiryin 47 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
+0.613 ms
in 47 d
ntp-4
+0.859 ms
in 47 d
ntp-10
+0.577 ms
in 47 d
Certificate (pool SNI)3/3 members OK
Expiryin 47 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
+1.208 ms
in 47 d
ntp-2
+1.216 ms
in 47 d
ntp-9
+1.204 ms
in 47 d
Certificate (pool SNI)3/3 members OK
Expiryin 47 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
+0.714 ms
in 47 d
ntp-6
+1.017 ms
in 47 d
ntp-8
+1.038 ms
in 47 d
Certificate (pool SNI)3/3 members OK
Expiryin 47 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
+0.613 ms
in 47 d
ntp-4
+0.859 ms
in 47 d
ntp-10
+0.577 ms
in 47 d
ntp-5
+0.714 ms
in 47 d
ntp-6
+1.017 ms
in 47 d
Certificate (pool SNI)5/5 members OK
Expiryin 47 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
+1.208 ms
in 47 d
ntp-2
+1.216 ms
in 47 d
ntp-9
+1.204 ms
in 47 d
Certificate (pool SNI)3/3 members OK
Expiryin 47 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
+1.216 ms
in 47 d
ntp-11
+1.111 ms
in 47 d
ntp-14
+1.671 ms
in 47 d
ntp-15
+0.824 ms
in 47 d
ntp-16
+0.169 ms
in 47 d
Certificate (pool SNI)5/5 members OK
Expiryin 47 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
-1.279 ms
in 47 d
ntp-13
-1.925 ms
in 47 d
Certificate (pool SNI)2/2 members OK
Expiryin 47 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: