4.1.0: hexadecimal notation

4.0.0: nip.io

ns-ovh-sg → ns-do-sg; +ns-gce

We replace `ns-ovh-sg` with `ns-do-sg`; this is a purely financial
decision: `ns-ovh-sg` costs $60/month, $720/year.

`ns-do-sg` (Digital Ocean), is also a Singapore-based DNS server. It's a
basic-regular-2vcpu-4GiB RAM-80GB SSD-4TiB bandwidth for $24/month,
$288/year.

That's a yearly savings of $432.

I had originally overspec'ed the Singapore server because I suspected
that there was a ton of traffic in Asia; I was wrong. It's not even 20%
the traffic of Europe or North America. I am confident the Digital Ocean
server will be able to handle it.

I also reintroduce `ns-gce` as the second server in North America, backing
up `ns-hetzner`. My hope is that `ns-hetzner` carries most of the load,
and `ns-gce` carries the rest, but not so much as to trigger Google
Cloud Platform's (GCP's) expensive bandwidth billing.

| DNS server | Queries / second |
|:-----------|-----------------:|
| ns-hetzner |          10706.4 |
| ns-ovh     |          10802.0 |
| ns-ovh-sg  |           1677.7 |

ns-gce is dead! Long live ns-ovh-sg!

I'm worried the traffic to my GCP server will cost me a hundred dollars
in bandwidth fees. It has a volume similar to my late AWS server which,
in its last month, racked up ~$130 in bandwidth fees!

I'm also trying to balance the servers more geographically: instead of
having two servers in the US and none in Asia, I'll have one server in
the US and one in Asia (Singapore).

The OVH server in Asia is expensive — $60/month instead of $20/month for
the OVH server in Warsaw. Also there's a monthly bandwidth cap in
Singapore in addition to the 300 Mbps cap.

I went with a dedicated server, similar to the one in Warsaw, but I took
the opportunity to upgrade it (same price):

- ns-ovh:    KS-4: Intel Xeon-E3 1230 v6
- ns-ovh-sg: KS-5: Intel Xeon-E3 1270 v6

I'm hoping that by adding this server to Singapore, the traffic to the
ns-ovh, the Warsaw server, will lessen, and I won't get thos "Anti-DDoS
protection enabled for IP address 51.75.53.19" emails every few days.

Current Queries per second:

- 4,087 ns-gce
- 1,131 ns-hetzner
- 7,183 ns-ovh

3.2.6: -ns-azure, ns-aws → "blocked"

3.2.5: Minor bugfixes, tweaks

3.2.4: Introduce new nameserver, ns-hetzner.sslip.io

3.2.3: ns-aws is no longer an NS for sslip.io

3.2.2: Join the Public Suffix List

3.2.1: Return NS records in random order