> ## Documentation Index > Fetch the complete documentation index at: https://docs.nxtdev.xyz/llms.txt > Use this file to discover all available pages before exploring further. # Supported DNS Record Types for nxtdev.xyz Subdomains > Field reference and validation rules for every DNS record type you can create on nxtdev.xyz: A, AAAA, CNAME, TXT, MX, SRV, and NS. nxtdev.xyz supports seven DNS record types. Each type has its own set of required fields and validation rules enforced at save time. The sections below document every field, its constraints, and a practical example you can adapt for your own use. An A record maps a host to an IPv4 address. Use it to point your subdomain (or a sub-host) directly at a server. | Field | Required | Constraints | | --------- | -------- | ------------------------------------------------------------------------------ | | `host` | Yes | `@` or a relative label; max 63 chars; lowercase alphanumeric, `.`, `_`, `-` | | `content` | Yes | Valid IPv4 address. Private ranges (10.x, 192.168.x, 172.16–31.x) are blocked. | | `ttl` | No | Integer, 60–86400. Defaults to 3600. | | `proxied` | No | `true` or `false`. Routes traffic through Cloudflare when enabled. | **Use case:** Point your apex subdomain at a VPS. ```text example A record theme={null} Type: A Host: @ Content: 203.0.113.42 TTL: 3600 Proxied: true ``` An AAAA record maps a host to an IPv6 address. It works identically to an A record but accepts IPv6 notation. | Field | Required | Constraints | | --------- | -------- | ----------------------------------------------- | | `host` | Yes | Same rules as A record host. | | `content` | Yes | Valid IPv6 address. Private ranges are blocked. | | `ttl` | No | Integer, 60–86400. Defaults to 3600. | | `proxied` | No | Available for AAAA records, same behavior as A. | **Use case:** Serve traffic over IPv6 from a dual-stack server. ```text example AAAA record theme={null} Type: AAAA Host: @ Content: 2001:db8::1 TTL: 3600 Proxied: false ``` A CNAME record creates an alias from one hostname to another. The content must be a hostname — IP addresses are rejected. | Field | Required | Constraints | | --------- | -------- | --------------------------------------------------------------- | | `host` | Yes | Relative label or `@`; max 63 chars. | | `content` | Yes | Valid hostname (max 255 chars, no consecutive dots, not an IP). | | `ttl` | No | Integer, 60–86400. Defaults to 3600. | | `proxied` | No | Available for CNAME records. | **Use case:** Point your subdomain at a Vercel deployment. ```text example CNAME record theme={null} Type: CNAME Host: @ Content: cname.vercel-dns.com TTL: 3600 Proxied: false ``` A TXT record stores arbitrary text. Common uses include SPF policies, DKIM public keys, and domain ownership verification tokens. | Field | Required | Constraints | | --------- | -------- | ------------------------------------ | | `host` | Yes | Relative label or `@`; max 63 chars. | | `content` | Yes | String, 1–1024 characters. | | `ttl` | No | Integer, 60–86400. Defaults to 3600. | Proxying is not available for TXT records. **Use case:** Add an SPF record to authorize your mail sender. ```text example TXT record theme={null} Type: TXT Host: @ Content: v=spf1 include:sendgrid.net ~all TTL: 3600 ``` An MX record specifies the mail server responsible for accepting email for a host. Lower priority values are tried first. | Field | Required | Constraints | | ---------- | -------- | ------------------------------------------------- | | `host` | Yes | Relative label or `@`; max 63 chars. | | `content` | Yes | Valid hostname (not an IP). | | `priority` | Yes | Integer, 0–65535. Defaults to 10 when left blank. | | `ttl` | No | Integer, 60–86400. Defaults to 3600. | Proxying is not available for MX records. **Use case:** Route incoming email through a third-party mail service. ```text example MX record theme={null} Type: MX Host: @ Content: mail.example.com Priority: 10 TTL: 3600 ``` An SRV record advertises the location of a specific service. The DNS name it creates follows the pattern `_service._proto.host.subdomain.nxtdev.xyz`. | Field | Required | Constraints | | ---------- | -------- | ----------------------------------------------------------------------- | | `host` | Yes | Relative label or `@`; max 63 chars. | | `service` | Yes | Must start with `_`, e.g. `_minecraft`. Lowercase alphanumeric and `-`. | | `proto` | Yes | One of `_tcp`, `_udp`, or `_tls`. | | `priority` | Yes | Integer, 0–65535. Defaults to 0. | | `weight` | Yes | Integer, 0–65535. Defaults to 0. | | `port` | Yes | Integer, 1–65535. | | `target` | Yes | Valid hostname (not an IP). | | `ttl` | No | Integer, 60–86400. Defaults to 3600. | Proxying is not available for SRV records. **Use case:** Advertise a Minecraft Java server so clients can connect with just your subdomain name. ```text example SRV record theme={null} Type: SRV Host: @ Service: _minecraft Proto: _tcp Priority: 0 Weight: 0 Port: 25565 Target: mc.example.com TTL: 3600 ``` An NS record delegates DNS authority for a zone to one or more nameservers. | Field | Required | Constraints | | --------- | -------- | -------------------------------------- | | `host` | Yes | Relative label or `@`; max 63 chars. | | `content` | Yes | Valid nameserver hostname (not an IP). | | `ttl` | No | Integer, 60–86400. Defaults to 3600. | Proxying is not available for NS records. Adding NS records at the apex (`@`) enables delegation mode for your subdomain. While delegation is active, all DNS editing is locked. See the Delegation documentation for details on how to manage this. **Use case:** Delegate a sub-zone to your own nameservers. ```text example NS record theme={null} Type: NS Host: @ Content: ns1.example.com TTL: 3600 ```