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).
12 + 7
Servers + pool
12/12
Reachable
11/11
NTS-KE OK
83 j
Min cert
4 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
Stratum3
RTT0.6 ms
Offset v4+0.123 ms
Offset v6+0.115 ms
24 h drift (offset v4, ms)
+1.00−0.37
min −0.37avg +0.13med +0.09max +1.00ms
Certificate*.rdem-systems.com
Issued byLet's Encrypt / YE1
Expiryin 83 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+0.019 ms
Offset v6+0.032 ms
24 h drift (offset v4, ms)
+0.89−0.34
min −0.34avg +0.02med −0.02max +0.89ms
Certificate*.rdem-systems.com
Issued byLet's Encrypt / YE1
Expiryin 83 d
9E:D2:E2:BA:D9:43:DF:45:15:D1:F1:7F…
ntp-9.rdem-systems.com
server
ns-arelion
Stratum2
RTT1.4 ms
Offset v4-0.062 ms
Offset v6+0.032 ms
24 h drift (offset v4, ms)
+1.06−0.41
min −0.41avg +0.08med +0.02max +1.06ms
Certificate*.rdem-systems.com
Issued byLet's Encrypt / YE1
Expiryin 83 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
Stratum3
RTT1.0 ms
Offset v4-0.143 ms
Offset v6-0.094 ms
24 h drift (offset v4, ms)
+0.77−0.53
min −0.53avg −0.03med −0.05max +0.77ms
Certificate*.rdem-systems.com
Issued byLet's Encrypt / YE1
Expiryin 83 d
9E:D2:E2:BA:D9:43:DF:45:15:D1:F1:7F…
ntp-4.rdem-systems.com
server
rtr-02.pa3
Stratum2
RTT0.9 ms
Offset v4-0.161 ms
Offset v6-0.065 ms
24 h drift (offset v4, ms)
+0.94−0.51
min −0.51avg −0.01med −0.04max +0.94ms
Certificate*.rdem-systems.com
Issued byLet's Encrypt / YE1
Expiryin 83 d
9E:D2:E2:BA:D9:43:DF:45:15:D1:F1:7F…
ntp-10.rdem-systems.com
server
ns-ielo
Stratum2
RTT1.5 ms
Offset v4-0.240 ms
Offset v6-0.117 ms
24 h drift (offset v4, ms)
+0.88−0.67
min −0.67avg −0.02med −0.06max +0.88ms
Certificate*.rdem-systems.com
Issued byLet's Encrypt / YE1
Expiryin 83 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
RTT0.5 ms
Offset v4-0.080 ms
Offset v6-0.105 ms
24 h drift (offset v4, ms)
+1.28−0.45
min −0.45avg +0.04med +0.01max +1.28ms
Certificate*.rdem-systems.com
Issued byLet's Encrypt / YE1
Expiryin 83 d
9E:D2:E2:BA:D9:43:DF:45:15:D1:F1:7F…
ntp-6.rdem-systems.com
server
rtr-02.pa5
Stratum2
RTT1.0 ms
Offset v4-0.172 ms
Offset v6-0.143 ms
24 h drift (offset v4, ms)
+1.16−0.52
min −0.52avg −0.02med −0.06max +1.16ms
Certificate*.rdem-systems.com
Issued byLet's Encrypt / YE1
Expiryin 83 d
9E:D2:E2:BA:D9:43:DF:45:15:D1:F1:7F…
ntp-8.rdem-systems.com
server
ns-rds
Stratum3
RTT0.5 ms
Offset v4+0.016 ms
Offset v6+0.029 ms
24 h drift (offset v4, ms)
+1.30−0.36
min −0.36avg +0.04med +0.01max +1.30ms
Certificate*.rdem-systems.com
Issued byLet's Encrypt / YE1
Expiryin 83 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
RTT14.0 ms
Offset v4-3.159 ms
Offset v6-3.198 ms
24 h drift (offset v4, ms)
−1.31−3.78
min −3.78avg −2.82med −2.82max −1.31ms
Certificate*.rdem-systems.com
Issued byLet's Encrypt / YE1
Expiryin 83 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
RTT11.0 ms
Offset v4+0.046 ms
Offset v6+0.084 ms
24 h drift (offset v4, ms)
+1.78−1.28
min −1.28avg +0.25med +0.24max +1.78ms
Certificate*.rdem-systems.com
Issued byLet's Encrypt / YE1
Expiryin 83 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
RTT3.0 ms
Offset v4-0.353 ms
Offset v6—
24 h drift (offset v4, ms)
+1.39−6.79
min −6.79avg −0.91med −0.66max +1.39ms
ⓘ NTP-only — NTS planned (chrony pending)
🌐 Pool entries (load-balanced) 7
ntp-pool.rdem-systems.com
pool
anycast / 11×A
24 h drift (offset v4, ms) · 11 servers
ntp-1
+0.123 ms
in 83 d
ntp-2
+0.019 ms
in 83 d
ntp-9
-0.062 ms
in 83 d
ntp-3
-0.143 ms
in 83 d
ntp-4
-0.161 ms
in 83 d
ntp-10
-0.240 ms
in 83 d
ntp-5
-0.080 ms
in 83 d
ntp-6
-0.172 ms
in 83 d
ntp-8
+0.016 ms
in 83 d
ntp-11
-3.159 ms
in 83 d
ntp-7
+0.046 ms
in 83 d
Certificate (pool SNI)11/11 members OK
Expiryin 83 d
DNS resolution11×A · 11×AAAA
pa3.ntp-pool.rdem-systems.com
pool
pool PA3
24 h drift (offset v4, ms) · 3 servers
ntp-3
-0.143 ms
in 83 d
ntp-4
-0.161 ms
in 83 d
ntp-10
-0.240 ms
in 83 d
Certificate (pool SNI)3/3 members OK
Expiryin 83 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
+0.123 ms
in 83 d
ntp-2
+0.019 ms
in 83 d
ntp-9
-0.062 ms
in 83 d
Certificate (pool SNI)3/3 members OK
Expiryin 83 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
-0.080 ms
in 83 d
ntp-6
-0.172 ms
in 83 d
ntp-8
+0.016 ms
in 83 d
Certificate (pool SNI)3/3 members OK
Expiryin 83 d
DNS resolution2×A · 2×AAAA
ielo.ntp-pool.rdem-systems.com
pool
pool IELO
24 h drift (offset v4, ms) · 5 servers
ntp-3
-0.143 ms
in 83 d
ntp-4
-0.161 ms
in 83 d
ntp-10
-0.240 ms
in 83 d
ntp-5
-0.080 ms
in 83 d
ntp-6
-0.172 ms
in 83 d
Certificate (pool SNI)5/5 members OK
Expiryin 83 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
+0.123 ms
in 83 d
ntp-2
+0.019 ms
in 83 d
ntp-9
-0.062 ms
in 83 d
Certificate (pool SNI)3/3 members OK
Expiryin 83 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
+0.019 ms
in 83 d
ntp-11
-3.159 ms
in 83 d
Certificate (pool SNI)2/2 members OK
Expiryin 83 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.
Free NTP Tools
Three independent tools to diagnose your time synchronization: