# Resolvers

`net/resolvers.md`, current. One row per address that appears in a
`/etc/resolv.conf` anywhere in the estate, per the quarterly sweep.

| Address | Name | Added | Added by | Zone served | Queries/day | Notes |
| --- | --- | --- | --- | --- | --- | --- |
| 192.0.2.1 | `ns-a.fen.internal` | 2014-06-02 | build | `fen.internal` | 4.1 M | Primary. Anycast with ns-b |
| 192.0.2.2 | `ns-b.fen.internal` | 2014-06-02 | build | `fen.internal` | 3.9 M | Secondary. Anycast with ns-a |
| 192.0.2.9 | `ns-lab.fen.internal` | 2021-11-30 | m.reyes | `lab.fen.internal` | 11 K | Lab only. Do not add to production images |
| 192.0.2.53 | — | — | — | — | 0 | Answers |

Sweep notes, appended by the sweep, not by a person:

| Sweep | 192.0.2.53 present in | Reachable | Serial |
| --- | --- | --- | --- |
| 2022-Q1 | 0 hosts | — | — |
| 2022-Q2 | 0 hosts | — | — |
| 2022-Q3 | 1 host (`bastion-02`) | yes | 2022093001 |
| 2022-Q4 | 4 hosts | yes | 2022093001 |
| 2023-Q1 | 11 hosts | yes | 2022093001 |
| 2023-Q2 | 38 hosts | yes | 2022093001 |
| 2023-Q3 | 106 hosts | yes | 2022093001 |
| 2023-Q4 | 291 hosts | yes | 2022093001 |
| 2024-Q1 | 604 hosts | yes | 2022093001 |
| 2024-Q2 | 1,180 hosts | yes | 2022093001 |
| 2024-Q3 | 1,181 hosts | yes | 2022093001 |
| 2024-Q4 | 1,181 hosts | yes | 2022093001 |
| 2025-Q1 | 1,181 hosts | yes | 2022093001 |
| 2025-Q2 | 1,181 hosts | yes | 2022093001 |
| 2025-Q3 | 1,181 hosts | yes | 2022093001 |
| 2025-Q4 | 1,181 hosts | yes | 2022093001 |
| 2026-Q1 | 1,181 hosts | yes | 2022093001 |
| 2026-Q2 | 1,181 hosts | yes | 2022093001 |

The estate has 1,181 hosts.

| Query | 192.0.2.1 | 192.0.2.53 |
| --- | --- | --- |
| `ns-a.fen.internal` | `192.0.2.1` | `NXDOMAIN` |
| `bastion-02.fen.internal` | `192.0.2.19` | `NXDOMAIN` |
| `hesper-01.fen.internal` | `192.0.2.31` | `NXDOMAIN` |
| `kestrel-04.fen.internal` | `NXDOMAIN` | `192.0.2.104` |
| `gate-02.fen.internal` | `NXDOMAIN` | `192.0.2.41` |
| `hesper-04.fen.internal` | `NXDOMAIN` | `192.0.2.34` |
| `sched-a.fen.internal` | `NXDOMAIN` | `192.0.2.61` |

See [[stories/kestrel-04]], [[stories/eleven-year-check]], [[stories/quorum]],
[[stories/nightly-0300]].