The following is a list of RADIUS attributes that may be returned by an Internet Authentication Server:
| Attribute | Attribute Format | Attribute Number |
| Reply-Message | string | 18 |
| Service-Type | integer | 6 |
| Session-Timeout | integer | 27 |
| State | string | 24 |
| Termination-Action | integer | 29 |
| Ascend-Send-Auth | integer | 231 |
| Ascend-Billing-Number | string | 249 |
| Callback-Number | string | 19 |
| Expiration | date | 21 |
| Ascend-Transit-Number | string | 251 |
| Ascend-Token-Expiry | integer | 204 |
| Ascend-Third-Prompt | string | 213 |
| Ascend-Target-Util | integer | 234 |
| Ascend-Send-Secret | string | 214 |
| Framed-IP-Netmask | ipaddr | 9 |
| Ascend-Add-Seconds | integer | 240 |
| Vendor-Specific | string | 26 |
| Ascend-Seconds-Of-History | integer | 238 |
| Login-IP-Host | ipaddr | 14 |
| Framed-IPX-Network | integer | 23 |
| Framed-MTU | integer | 12 |
| Framed-Protocol | integer | 7 |
| Framed-Route | string | 22 |
| Framed-Routing | integer | 10 |
| Idle-Timeout | integer | 28 |
| Framed-IP-Address | ipaddr | 8 |
| Framed-Compression | integer | 13 |
| Port-Limit | integer | 62 |
| Framed-AppleTalk-Network | integer | 38 |
| Class | string | 25 |
| Login-LAT-Group | string | 36 |
| Login-LAT-Node | string | 35 |
| Login-LAT-Service | string | 34 |
| Login-Port | integer | 16 |
| Login-Service | integer | 15 |
| Framed-AppleTalk-Link | integer | 37 |
| Filter-Id | string | 11 |
| Ascend-Assign-IP-Pool | integer | 218 |
| Framed-AppleTalk-Zone | string | 39 |
| Ascend-PPP-VJ-1172 | integer | 211 |
| Ascend-IPX-Peer-Mode | integer | 216 |
| Ascend-Link-Compression | integer | 233 |
| Ascend-Maximum-Channels | integer | 235 |
| Ascend-Menu-Item | string | 206 |
| Ascend-Menu-Selector | string | 205 |
| Ascend-Metric | integer | 225 |
| Ascend-MPP-Idle-Percent | integer | 254 |
| Ascend-Netware-timeout | integer | 223 |
| Ascend-Send-Passwd | string | 232 |
| Ascend-PPP-Async-Map | integer | 212 |
| Ascend-IP-Pool-Definition | string | 217 |
| Ascend-PPP-VJ-Slot-Comp | integer | 210 |
| Ascend-Preempt-Limit | integer | 245 |
| Ascend-PRI-Number-Type | integer | 226 |
| Ascend-PW-Lifetime | integer | 208 |
| Ascend-PW-Warntime | integer | 207 |
| Ascend-Receive-Secret | string | 215 |
| Ascend-Remove-Seconds | integer | 241 |
| Ascend-Route-IP | integer | 228 |
| Ascend-Route-IPX | integer | 229 |
| Ascend-PPP-Address | ipaddr | 253 |
| Ascend-FR-Direct-Profile | string | 220 |
| Ascend-Call-By-Call | integer | 250 |
| Ascend-Call-Filter | abinary | 243 |
| Ascend-Callback | integer | 246 |
| Ascend-Data-Filter | abinary | 242 |
| Ascend-Data-Svc | integer | 247 |
| Ascend-Dec-Channel-Count | integer | 237 |
| Ascend-Dial-Number | string | 227 |
| Ascend-Force-56 | integer | 248 |
| Ascend-FR-Direct | integer | 219 |
| Ascend-FR-Direct-DLCI | integer | 221 |
| Ascend-IPX-Alias | integer | 224 |
| Ascend-Handle-IPX | integer | 222 |
| Ascend-History-Weigh-Type | integer | 239 |
| Ascend-Host-Info | string | 252 |
| Ascend-Idle-Limit | integer | 244 |
| Ascend-Inc-Channel-Count | integer | 236 |
| Ascend-IP-Direct | ipaddr | 209 |
| Ascend-Bridge | integer | 230 |