math.nu - dns.ninja
math.nu
| DNSSEC | 🔒 Signed (DS record present) | ||||||
| A | 81.235.195.123🇸🇪 TELIANET-SWEDEN81.224.0.0/12 TELIANET-BLK | ||||||
| PTR | 81-235-195-123-no600.tbcn.telia.com | ||||||
| NS | ns1.loopia.se ⭐ | ||||||
| A | 2a02:250:ffff::20🇸🇪 LOOPIA2a02:250:ffff::/48 | ||||||
| PTR | ns1.loopia.se | ||||||
| A | 93.188.0.20🇸🇪 LOOPIA93.188.0.0/24 SE-LOOPIA Loopia AB | ||||||
| PTR | ns1.loopia.se | ||||||
| NS | ns2.loopia.se | ||||||
| A | 2a02:250:fffe::20🇸🇪 LOOPIA22a02:250:fffe::/48 | ||||||
| PTR | ns2.loopia.se | ||||||
| A | 185.71.156.20🇸🇪 LOOPIA2185.71.156.0/24 | ||||||
| PTR | ns2.loopia.se | ||||||
| MX | mail.protonmail.ch ⭐ | ||||||
| A | 176.119.200.128🇨🇭 Proton176.119.200.0/24 | ||||||
| PTR | mail.protonmail.ch | ||||||
| A | 185.70.42.128🇨🇭 Proton185.70.42.0/24 | ||||||
| PTR | mail.protonmail.ch | ||||||
| A | 185.205.70.128🇫🇷 Proton185.205.70.0/24 | ||||||
| PTR | mail.protonmail.ch | ||||||
| MX | mailsec.protonmail.ch(20) | ||||||
| A | 176.119.200.129🇨🇭 Proton176.119.200.0/24 | ||||||
| PTR | mailsec.protonmail.ch | ||||||
| A | 185.70.42.129🇨🇭 Proton185.70.42.0/24 | ||||||
| PTR | mailsec.protonmail.ch | ||||||
| A | 185.205.70.129🇫🇷 Proton185.205.70.0/24 | ||||||
| PTR | mailsec.protonmail.ch | ||||||
| TXT | protonmail-verification=11bd9ed133ab23e1392f91973734652d992ba577 | ||||||
| TXT | v=spf1 include:_spf.protonmail.ch ~all | ||||||
| SOA | ns1.loopia.seregistry@loopia.se serial=1782950400 | ||||||
nu
| DNSSEC | 🔒 Signed (DS record present) | ||||||
| NS | catcher-in-the-rye.nic.nu ⭐ | ||||||
| NS | a.ns.nu | ||||||
| NS | c.ns.nu | ||||||
| NS | d.ns.nu | ||||||
| NS | m.ns.nu | ||||||
| NS | y.ns.nu | ||||||
| NS | z.ns.nu | ||||||
| TXT | id:ae8752cf-e113-48dc-8b01-b95aa0d9ee58 | ||||||
| TXT | NU zone update: 2026-07-05 09:38:10 +0000 (EPOCH 1783244290) (auto) | ||||||
| SOA | catcher-in-the-rye.nic.nuhostmaster@nic.nu serial=1783244346 | ||||||
Previously MX for
math.nu |
Same first word
Similar names
DNS History
16 records (5 active, 11 former)
○NSns1.boomer.se2015-08-19 → 2016-06-18 · 4 obs
● 2016-06-18 13:10:06
○ 2017-08-06 06:22:28
○ 2026-07-05 10:16:30
●NSns1.loopia.se2017-08-06 → 2026-07-05 · 3 obs
● 2017-08-06 06:22:28
● 2026-07-05 10:16:30
○NSns1.math.nu2015-08-19 → 2016-06-18 · 4 obs
● 2016-06-18 13:10:06
○ 2017-08-06 06:22:28
○ 2026-07-05 10:16:30
●NSns2.loopia.se2017-08-06 → 2026-07-05 · 3 obs
● 2017-08-06 06:22:28
● 2026-07-05 10:16:30
○MXalt1.aspmx.l.google.com2021-11-02 → 2026-04-25 · 5 obs
● 2021-11-02 13:20:06
● 2026-04-25 14:46:54
○ 2026-06-05 22:30:08
○ 2026-07-05 10:16:30
○MXalt2.aspmx.l.google.com2021-11-02 → 2026-04-25 · 5 obs
● 2021-11-02 13:20:06
● 2026-04-25 14:46:54
○ 2026-06-05 22:30:08
○ 2026-07-05 10:16:30
○MXaspmx.l.google.com2021-11-02 → 2026-04-25 · 5 obs
● 2021-11-02 13:20:06
● 2026-04-25 14:46:54
○ 2026-06-05 22:30:08
○ 2026-07-05 10:16:30
○MXaspmx2.googlemail.com2021-11-02 → 2026-04-25 · 5 obs
● 2021-11-02 13:20:06
● 2026-04-25 14:46:54
○ 2026-06-05 22:30:08
○ 2026-07-05 10:16:30
○MXaspmx3.googlemail.com2021-11-02 → 2026-04-25 · 5 obs
● 2021-11-02 13:20:06
● 2026-04-25 14:46:54
○ 2026-06-05 22:30:08
○ 2026-07-05 10:16:30
○MXmail.oblivion.nu2017-08-06 → 2017-08-06 · 4 obs
● 2017-08-06 06:22:28
○ 2021-11-02 13:20:06
○ 2026-07-05 10:16:30
●MXmail.protonmail.ch2026-06-05 → 2026-07-05 · 3 obs
● 2026-06-05 22:30:08
● 2026-07-05 10:16:30
○MXmail1.boomer.se2015-08-19 → 2016-06-18 · 4 obs
● 2016-06-18 13:10:06
○ 2017-08-06 06:22:28
○ 2026-07-05 10:16:30
●MXmailsec.protonmail.ch2026-06-05 → 2026-07-05 · 3 obs
● 2026-06-05 22:30:08
● 2026-07-05 10:16:30
○MXmath.nu2015-08-19 → 2016-06-18 · 4 obs
● 2016-06-18 13:10:06
○ 2017-08-06 06:22:28
○ 2026-07-05 10:16:30
○A78.72.181.412015-08-19 → 2016-06-18 · 4 obs
● 2016-06-18 13:10:06
○ 2017-08-06 06:22:28
○ 2026-07-05 10:16:30
●A81.235.195.1232017-08-06 → 2026-07-05 · 3 obs
● 2017-08-06 06:22:28
● 2026-07-05 10:16:30
🔍 DNS Trace
📋 Delegation Chain
| Zone | Nameservers | Glue |
|---|---|---|
| nu | a.ns.nu, c.ns.nu, d.ns.nu, m.ns.nu... | - |
| math.nu | ns2.loopia.se, ns1.loopia.se | - |
✅ Authoritative Response
Server:185.71.156.20
NS records: ns2.loopia.se, ns1.loopia.se
🔒 DNSSEC Status
🔐 Secure (DNSSEC validated)
Chain of trust verified from root to domain
⏱️ Timing
Total: 1613ms | Queries: -
📄 Records
| Type | Count | Sample Data |
|---|---|---|
| A | 1 | 81.235.195.123 |
| NS | 2 | ns2.loopia.se, ns1.loopia.se |
| MX | 2 | mailsec.protonmail.ch (pri: 20), mail.protonmail.ch (pri: 10) |
| TXT | 2 | protonmail-verification=11bd9ed133ab23e1, v=spf1 include:_spf.protonmail.ch ~all |
| SOA | 1 | ns1.loopia.se registry.loopia.se |
Analysis
IP Addresses
math.nu has exactly one IP address — 81.235.195.123.
Other host names, among them 81-235-195-123-no600.tbcn.telia.com and esoteric.se, have IP numbers in common with math.nu.
Name Servers
The NS records for math.nu delegate to ns1.loopia.se and ns2.loopia.se.
The name server configuration of math.nu is shared with other domains, for instance optv.se, bellamare.rs, zadovoljna.rs and two others.
At least some of math.nu's name servers are shared with other domains, for example geoforum.com and icuscandinavia.net.
These name servers tend to be used in conjunction with the name servers ns3.loopia.se.
ns1.loopia.se resolves to 93.188.0.20 and 2a02:250:ffff::20. Likewise, ns2.loopia.se resolves to 185.71.156.20 and 2a02:250:fffe::20 — two IP addresses apiece.
Mail Servers
math.nu uses two mail servers, mail.protonmail.ch and mailsec.protonmail.ch.
The mail server setup of math.nu matches that of other domains such as paratus.com.au, sassanelli.it, uniongoapp.com and two others.
At least some of the mail servers used by math.nu are shared with other domains: blockasset.io, meadow.ws, augustinmuller.com and two others among them.
The hosts mail.protonmail.ch and mailsec.protonmail.ch both resolve to three IP numbers: mail.protonmail.ch to 176.119.200.128, 185.70.42.128 and 185.205.70.128, and mailsec.protonmail.ch to 176.119.200.129, 185.70.42.129 and 185.205.70.129.