Net

MCP server for network engineering — BGP routing analysis, RPKI validation, DNSSEC-aware DNS, and historical route data from MRT archives.

Gives LLMs structured access to real network state using public data sources (RIPE RIS, RIPEstat, RPKI repositories, bgp.tools, bgproutes.io).

Example Queries

Once connected as an MCP server, an LLM can answer questions like:

• "Is 1.1.1.0/24 RPKI valid?" → rpki_validate
• "Who originates 8.8.8.0/24?" → bgp_prefix_origin
• "What does Cloudflare's AS footprint look like?" → bgp_asn_info(13335)
• "Is cloudflare.com DNSSEC signed?" → dns_lookup or dns_trace
• "Show me routes to 1.1.1.0/24 from Tokyo" → ris_collectors(region='asia') then bgp_route_lookup(prefix, collector='RRC06')
• "What did routing look like for 8.8.8.0/24 two days ago?" → mrt_search then bgp_historical_lookup
• "What route objects does AS13335 have in IRR?" → irr_route_lookup
• "Where does Cloudflare peer?" → peeringdb_network(13335)
• "What ASes are at AMS-IX?" → peeringdb_ix("AMS-IX", include_members=True)
• "Split 10.0.0.0/24 into /26s" → subnet_split
• "Is 192.168.1.1 a bogon?" → bogon_check
• "Do these two prefixes overlap?" → prefix_overlap
• "Ping 1.1.1.1 from my machine" → local_ping
• "What's my public IP?" → local_public_ip
• "Trace the path to 8.8.8.8" → local_traceroute
• "What ports are open on 192.168.1.1?" → local_nmap
• "Show my routing table" → local_routes

Tools

DNS

Tool	Description
dns_lookup	Query DNS records (A, AAAA, MX, NS, TXT, SOA, CNAME, PTR, SRV, CAA) with DNSSEC validation status
dns_trace	Trace delegation chain from root to authoritative, showing DNSSEC signing status at each zone level

RPKI & ASPA

Tool	Description
rpki_validate	Validate a prefix + origin ASN pair against RPKI ROAs. Queries RIPEstat (ROA details) and Cloudflare Radar (status cross-check)
rpki_roa_lookup	Look up all ROAs for a given prefix or ASN, including max-length and trust anchor
rpki_aspa_lookup	Look up ASPA objects — which upstream providers an AS has authorized (Cloudflare Radar)
rpki_aspa_changes	Track ASPA object changes over time — additions, removals, modifications (Cloudflare Radar)

BGP — Live

Tool	Description
bgp_route_lookup	Look up current BGP routes for a prefix. Optionally filter by RIPE RIS collector for regional perspective
bgp_prefix_origin	Find which AS(es) originate a prefix, with AS name enrichment
bgp_asn_info	Get AS name, all announced prefixes (v4/v6), upstream providers, and total prefix count

BGP — Collectors & Historical

Tool	Description
ris_collectors	List RIPE RIS route collectors with location, peer counts, and type (IXP vs multihop). Filter by region
mrt_search	Find available MRT archive files (RIB dumps or updates) for a time range and collector
bgp_historical_lookup	Download and parse MRT files to retrieve BGP routes for a prefix at a specific point in time

BGP — Security (Cloudflare Radar)

Tool	Description
bgp_hijacks	Search BGP origin hijack events with confidence scores, affected prefixes, hijacker/victim ASNs
bgp_leaks	Search BGP route leak events — improper route propagation between peers

These tools require a Cloudflare Radar API token (CLOUDFLARE_API_TOKEN). Free to obtain at dash.cloudflare.com/profile/api-tokens.

IRR (Internet Routing Registry)

Tool	Description
irr_route_lookup	Look up route objects by prefix or origin ASN across RADB, RIPE, ARIN, and other registries
irr_autnum	Look up aut-num objects — AS name, description, import/export policies
irr_as_set_expand	Expand an AS-SET into its member ASNs (e.g. AS-CLOUDFLARE → list of ASNs)

PeeringDB

Tool	Description
peeringdb_network	Look up a network by ASN — peering policy, IXP presence, port speeds, IRR as-set
peeringdb_ix	Search IXPs by name or city — location, member list, route server info
peeringdb_facility	Search data center facilities — location, network count

IP/Subnet Math & Bogon Detection

Tool	Description
subnet_info	Get full details on a prefix — network/broadcast, host count, private/global classification
subnet_split	Split a prefix into smaller subnets (e.g. /24 → four /26s)
ip_contains	Check if an IP or prefix is within a network (e.g. is 10.5.5.1 in 10.0.0.0/8?)
prefix_overlap	Check if two prefixes overlap and the relationship (contains, equal, disjoint)
supernet_aggregate	Aggregate contiguous prefixes into the smallest covering supernet
bogon_check	Check if an IP/prefix is reserved space (RFC 1918, CGNAT, documentation, multicast, etc.)

Local Diagnostics

Tools that run standard CLI commands on the user's machine. All inputs are validated and passed as list arguments to subprocess (never shell=True) to prevent command injection.

Tool	Description	Admin Required
local_ping	Ping a host with configurable count and timeout	No
local_traceroute	Trace network path to a host (UDP mode)	No
local_mtr	Combined ping + traceroute with per-hop stats	Yes (raw sockets)
local_dig	DNS lookup via dig (falls back to nslookup)	No
local_interfaces	Show network interfaces and IP addresses	No
local_routes	Show the local routing table	No
local_connections	Show active TCP/UDP connections and listening ports	No (PIDs need admin)
local_arp	Show ARP table (IP-to-MAC mappings)	No
local_whois	Whois lookup for domains, IPs, or ASNs	No
local_curl	Make HTTP requests, check headers and connectivity	No
local_nmap	TCP connect scan (port scanning, no SYN scan)	No
local_netstat_stats	Show TCP/UDP/ICMP protocol statistics	No
local_public_ip	Get the public-facing IP of the machine	No

Tools that require admin privileges will attempt to run and return a clear error message if permission is denied. Cross-platform: macOS, Linux, and Windows.

Data Sources

Data sources are queried in this priority order:

Source	Auth	Used For
RIPEstat	None (free)	BGP looking glass, routing status, prefix origins, AS info, RPKI validation, collector metadata. Primary for most queries
Cloudflare Radar	Free API token	Real-time BGP routes, prefix-to-ASN with RPKI status, BGP hijack detection, BGP route leak detection. Primary alongside RIPEstat
bgproutes.io	API key required	RIB snapshots with RPKI ROV + ASPA validation, BGP updates, AS topology. Only used when API key is configured
bgp.tools	None (free)	ASN-to-name mappings (asns.csv, cached in-memory), full BGP table (table.jsonl, last resort)
RIPE RIS MRT archive	None (free)	Historical RIB dumps and BGP update files, accessed via BGPKIT Broker + Parser
IRR databases	None (free)	Route objects, aut-num, AS-SET expansion via whois protocol (RADB, RIPE, ARIN, APNIC, etc.)
PeeringDB	None (free)	Network peering info, IXP membership, facility data. No API key needed for read-only
dnspython	N/A (local)	All DNS queries and DNSSEC validation

All RIPEstat requests include sourceapp=net-mcp per their API guidelines.

Usage

With Claude Code

Add to your MCP server configuration (~/.claude/settings.json or project .claude/settings.json):

{
  "mcpServers": {
    "net-mcp": {
      "command": "uv",
      "args": ["run", "--directory", "/path/to/net-mcp", "net-mcp"]
    }
  }
}

Standalone

uv run net-mcp

Configuration

Settings are loaded from (in priority order):

1. Environment variables (NET_MCP_* prefix)
2. Config file (config.toml)
3. Built-in defaults

Config file is searched at:

1. Path in NET_MCP_CONFIG env var
2. ./config.toml (next to pyproject.toml)
3. ~/.config/net-mcp/config.toml

config.toml

[storage]
# Directory for downloaded MRT files (RIB dumps can be ~400MB each).
# Default: system temp directory (/tmp/net-mcp/mrt)
mrt_cache_dir = "/path/to/mrt/cache"

# Maximum cache size in GB. Oldest files are removed when exceeded.
mrt_max_cache_gb = 10

[api]
# bgproutes.io API key (or set BGPROUTES_API_KEY env var)
bgproutes_api_key = "your-key-here"

[bgp]
# Default RIPE RIS collector for queries
default_collector = "rrc00"

[dns]
# Default DNS resolver
resolver = "1.1.1.1"

Environment Variables

Variable	Description	Default
NET_MCP_CONFIG	Path to config file	(auto-detected)
NET_MCP_MRT_CACHE_DIR	MRT file download/cache directory	/tmp/net-mcp/mrt
NET_MCP_MRT_MAX_CACHE_GB	Max cache size before evicting old files	10
NET_MCP_DEFAULT_COLLECTOR	Default RIPE RIS collector ID	rrc00
NET_MCP_DNS_RESOLVER	Default DNS resolver IP	1.1.1.1
CLOUDFLARE_API_TOKEN	Cloudflare Radar API token (get one free)	(none)
BGPROUTES_API_KEY	bgproutes.io API key	(none)

MRT File Caching

Historical BGP lookups download MRT files from the RIPE RIS archive. These files can be large:

• RIB dumps (bview): ~400MB each, created every 8 hours (00:00, 08:00, 16:00 UTC)
• Update files (updates): ~3MB each, created every 5 minutes

Downloaded files are cached at <mrt_cache_dir>/<collector>/<year.month>/<filename>.gz and reused on subsequent queries. The cache is automatically pruned when it exceeds mrt_max_cache_gb.

Development

git clone <repo>
cd net-mcp
uv sync --group dev
uv run pytest

License

MIT