3位编码体系全球管理手册 V1.0 3-Digit Coding System Global Management Manual V1.0

1. General Principles

1.1 Core Design Principles

1. 3-Digit Code Limit: The entire network uniformly uses 3-digit pure numeric codes (000-999) without letters or mixtures, adapting to the simple resolution requirements of Mesh network nodes;
2. CN Maximize Allocation: Exclusive whole hundred coding segment for China mainland, meeting the unlimited allocation needs of massive interconnectable networks in the region;
3. Global Country Preoccupation: Preoccupy exclusive coding segments for mainstream countries/regions in accordance with international practices;
4. Small Country Adaptation: Reserve special coding segments for countries/regions with occupied codes or micro-scale territories to achieve global full coverage;
5. Resolution Isolation Control: Strictly isolate development/test segments from public network segments, the authoritative resolution system shields test segments to avoid public network interference;
6. One Code One Unique Network: A single 3-digit code uniquely corresponds to an independent Mesh network without repetition or reuse to ensure network uniqueness.

1.2 Division of Administrative Subjects

1. China Mainland O&M Core Team: Responsible for the full-process management of the 800-899 coding segment with independent decision-making power;
2. Global Network Coordination Team: Responsible for global network coordination of 100-199/200-799/900-979/999 coding segments;
3. Local O&M Teams: Responsible for local allocation, configuration and interconnection permission control of the assigned exclusive coding segments;
4. R&D/Testing Teams: Responsible for the internal use of the 980-998 test segment, only closed-loop networking, no participation in public network control.

2. Global Coding Segment Division & Core Rules

The global 3-digit codes (000-999) are divided into 6 major segments according to purpose, ownership and scenario, with isolated segments, clear rules, serving as the basic basis for global networking.

2.1 General Supplementary Rules

1. Fixed Core Root Network: The first code of each exclusive segment is the regional core root network (e.g., 800 = China Mainland Core), which cannot be allocated to ordinary independent networks;
2. IP Allocation Standard: Public network segments (except 900-979) are configured with dual IP (public + intranet), 900-979 segment is only configured with public IP;
3. Continuous Allocation Principle: Each public segment is allocated continuously on demand with the first code as the core.

3. Detailed Management Rules for Each Coding Segment

3.3 China Mainland Exclusive Maximization Segment (800-899)

3.3.1 Core Management Rules

1. Core Root Network: 800 is the national core root network of China Mainland, serving as the unified export of the entire domestic network, only for backbone forwarding, not participating in business networking;
2. Allocation Rule: 801-899 has no hierarchy or application system, unlimited continuous allocation on demand, which can be divided by province/city/industry/enterprise and government at will;
3. Independent Control: China Mainland O&M Core Team has full independent decision-making power over the allocation, configuration and interconnection permissions of this segment without global coordination;
4. Expansion Backup: After 801-899 is fully allocated, the 900-979 segment codes can be directly used, and independent allocation only needs to be filed with the global team.

3.6 Global Unique Independent Segment (999)

1. Positioning: The only public independent Mesh network in the entire network, without regional/country restrictions, serving as a public backbone node for global cross-regional interconnection;
2. Configuration Rule: Configured with dual IP (public + intranet), uniformly configured and real-time monitored by the Global Network Coordination Team;
3. Interconnection Control: Interconnectable with all global public network coding segments, permissions are uniformly configured by the global team through DNS TXT records;
4. Usage Rule: Only used as a global public interconnection node, not allocated to the exclusive business networking of any country/region.

4. DNS Resolution Configuration Standard

All public network coding segments follow the unified configuration standard in the nid.meshcc.ai authoritative resolution system, with only A records (IP mapping) and TXT records (control information) configured.

4.2 Standardized TXT Record Fields (Global Unified)

JSON fields are the core basis for Mesh network nodes to resolve interconnection permissions, no random addition/deletion of fields, compact format without spaces:

Core Field Description

• code: 3-digit pure number, exactly the same as the DNS record name;
• region: Regional ID (CN/NA/EU/AP/SM/GLOBAL);
• allow: List of 3-digit codes for interconnection, empty array means prohibiting all interconnection;
• ipType: IP type, only fill in ["public"] for 900-979 segment.

5. Cross-Network Interconnection Control Rules

Cross-network interconnection of the global Mesh network is realized with automatic and refined control based on 3-digit code + DNS TXT record fields. Nodes automatically resolve the TXT record of the target code and establish connections according to rules without manual intervention.

5.1 Domestic/Segment Interconnection Rule (Same region ID)

1. The node resolves the region field of the target code, if it is consistent with its own, it is judged as domestic/segment interconnection;
2. Priority to read the intranet IP in ipType to try to establish a connection, automatically switch to public IP if it fails;
3. Only when both parties are in each other's allow list, the connection can be successfully established to achieve two-way authorization.

5.3 Global Independent Network Interconnection Rule (region=GLOBAL)

1. 999 global independent network follows one-way authorization as the main principle, its allow list is a white list, only codes in the list can actively establish connections;
2. When 999 establishes a connection to other codes, it needs to satisfy that it is in the allow list of the target code;
3. When 999 interconnects with China Mainland nodes, it supports intranet IP connection to improve interconnection efficiency.

6. Code Allocation & Expansion Standard

6.1 Code Allocation Process

1. China Mainland (800-899): The local team submits requirements to the domestic core team, which is directly allocated after approval and takes effect in real time;
2. Mainstream Countries (100-199/200-799): The local team submits an application to the Global Network Coordination Team, and the assigned exclusive segment code is allocated after approval;
3. Small Countries (900-979): The networking subject submits a written application to the global team, and 1-3 codes are allocated after approval;
4. Test Segment (980-998): Each R&D team independently allocates internally without application process, only keeps internal records.

6.2 China Mainland Expansion Standard

1. Phase 1: 801-899 are continuously allocated until fully configured;
2. Phase 2: Directly use the codes of the 900-979 special adaptation segment, independent allocation only needs to be filed;
3. The expanded codes enjoy the same independent control rights as the 800-899 segment.

7. O&M Management & Traceability Requirements

7.1 Code Management System

1. Establish China Mainland and global code management systems to realize unified management of the entire code life cycle;
2. The system records code allocation time, ownership subject, IP configuration, update records, etc., with a retention period of not less than 5 years;
3. The system supports code retrieval, status screening and log query to facilitate quick problem location.

7.4 Network Fault Troubleshooting Steps

Troubleshoot in the following steps when cross-network interconnection fails:

1. Check whether the status of itself and the target code is active;
2. Check whether both parties are in each other's allow list;
3. Check whether the IP configuration is correct and the network is unobstructed;
4. Check whether the region ID matches the interconnection rules.

8. Supplementary Provisions

1. This manual is jointly formulated by the China Mainland O&M Core Team and the Global Network Coordination Team, which reserves the final right of interpretation;
2. After the entry into force of this manual, all Mesh network deployments based on nid.meshcc.ai must be strictly followed, and the responsible administrative subject shall be liable for network faults caused by violations;
3. This manual can be revised according to the changes in global networking needs, a new version will be released after revision, and the old version will be automatically invalidated;
4. The annexes of this manual have the same legal effect as the manual;
5. This manual shall come into force on February 08, 2026.

Formulating Units: nid.meshcc.ai China Mainland O&M Core Team, nid.meshcc.ai Global Network Coordination Team

Signing Date: February 08, 2026