# 129.6.15.28 — IP Intelligence Summary

129.6.15.28 is an IPv4 address operated by National Institute of Standards and Technology (AS49), geolocated to Gaithersburg, United States. It is known as NIST Time Server (time-a-g). Its reverse DNS name is time-a-g.nist.gov. As of November 6, 2026, IPDebrief rates it Low Risk (0/100); no anonymizing service was detected.

- Canonical page: https://ipdebrief.com/129.6.15.28
- Last updated: 2026-11-06

## Ownership

- Organization: National Institute of Standards and Technology
- Network name: NIST-G
- Allocated block: 129.6.0.0/16
- ASN: AS49 (https://ipdebrief.com/asn/49)
- Regional registry: ARIN

## Location

- City: Gaithersburg
- Region: Maryland
- Country: United States
- Time zone: —

## Network classification

- Infrastructure type: —
- Datacenter / hosting: no
- Residential: no
- Mobile: no
- Anycast: no
- Tor exit node: no
- VPN: no
- Proxy: no

## Risk assessment

- Assessment: Low Risk (0/100)
- Blocklist listings: 0
- Suspicious activity indicators: no
- Spam source: no

## Reverse DNS

- time-a-g.nist.gov
- Forward-confirmed: yes

## Nearby addresses

- 129.6.15.29 (https://ipdebrief.com/129.6.15.29)

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Source: IPDebrief, "129.6.15.28 IP intelligence", https://ipdebrief.com/129.6.15.28, updated 2026-11-06. Assessments are probabilistic.